docs(ledger): V1-A landed and deployed

build 23cdb31. Live harness 20/20. V1-A status in master-plan-status.md
flipped to ✅; V1-B is the next phase. 605 tests on main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

DEV-LEDGER.md

@@ -6,26 +6,26 @@
 
 ## Orientation
 
-- **live_sha** (Dalidou `/health` build_sha): `7042eae` (verified 2026-04-29T01:19Z; status=ok; deployed 2026-04-25T01:04Z, docs-only on top of `d3de9f6`)
-- **last_updated**: 2026-04-29 by Claude (Wave 1 debt-pay branch open; Codex review of plan applied)
-- **main_tip**: `7042eae`
-- **test_count**: 581 on `claude/wave1-dashboard-counts-and-memory-fixes` (572 on main + 9 Wave 1 regressions)
-- **harness**: `20/20 PASS` on live Dalidou, 0 blocking failures, 0 known issues (last harness run nightly 2026-04-28T03:00:30Z)
+- **live_sha** (Dalidou `/health` build_sha): `23cdb31` (verified 2026-04-29T17:04:05Z post V1-A deploy; status=ok)
+- **last_updated**: 2026-04-29 by Claude (Wave 1 + Wave 1.5 + V1-A all squash-merged and deployed today)
+- **main_tip**: `23cdb31`
+- **test_count**: 605 on `main` (572 + 14 Wave 1 + 10 Wave 1.5 + 9 V1-A)
+- **harness**: `20/20 PASS` on live Dalidou against `23cdb31`, 0 blocking failures, 0 known issues
 - **vectors**: 33,253
-- **active_memories**: 315 dashboard / 1091 integrity (verified live 2026-04-29). Discrepancy was a dashboard sampling bug — Wave 1 commit `fb4d55c` replaces it with SQL aggregates; post-deploy the two will agree.
-- **candidate_memories**: 0 (queue drained, +103 captures since 2026-04-25)
+- **active_memories**: 1170 dashboard (live SQL post-fix) vs 1091 integrity-panel snapshot (last nightly 2026-04-28T03:00:30Z; difference is ~80 captures since the snapshot — no longer a sampling artifact). Total memories: 2436. Pre-deploy the dashboard reported 315 due to a confidence-sorted limit=500 sampling bug, now closed.
+- **candidate_memories**: 44 (live as of 2026-04-29T02:00Z; queue accumulated since the 2026-04-28 nightly autotriage)
 - **interactions**: 1054 (claude-code 474, openclaw 576; verified `/admin/dashboard` 2026-04-29)
-- **registered_projects**: atocore, p04-gigabit, p05-interferometer, p06-polisher, atomizer-v2, abb-space (aliased p08). **Auto-detected, unregistered**: apm (63 active memories), openclaw (9), lead-space (2), drill (1), optiques-fullum (1) — see Wave 1 follow-up below.
+- **registered_projects** (8): atocore, p04-gigabit, p05-interferometer, p06-polisher, atomizer-v2, abb-space (aliased p08), **apm** (registered 2026-04-29 — Atomaste Parts Manager I03), **openclaw** (registered 2026-04-29 — external LLM agent harness, read-only pull integration; alias `clawd`). `/admin/projects/proposals?min_active=10` is now empty.
 - **project_state_entries**: 128 across registered projects (verified 2026-04-29)
 - **entities**: 66 (V1-0 backfill complete; 0 open conflicts)
 - **off_host_backup**: `papa@192.168.86.39:/home/papa/atocore-backups/` via cron, verified
 - **nightly_pipeline**: backup → cleanup → rsync → OpenClaw import → vault refresh → extract → auto-triage → auto-promote/expire → weekly synth/lint Sundays → retrieval harness → pipeline summary
 - **capture_clients**: claude-code (Stop hook + cwd project inference), openclaw (before_agent_start + llm_output plugin, verified live)
 - **wiki**: http://dalidou:8100/wiki (browse), /wiki/projects/{id}, /wiki/entities/{id}, /wiki/search
-- **dashboard**: http://dalidou:8100/admin/dashboard
-- **active_track**: Wave 1 debt-pay (this session) → V1-A start. V1-A gates have cleared (soak ended 2026-04-26; density 315 ≫ 100). Plan: `docs/plans/engineering-v1-completion-plan.md`. Resume map: `docs/plans/v1-resume-state.md`.
+- **dashboard**: http://dalidou:8100/admin/dashboard (now reports SQL-aggregate counts; new fields: `memories.total`, `memories.by_status`)
+- **active_track**: Wave 1 + Wave 1.5 + V1-A closed → V1-B is the next phase (KB-CAD/KB-FEM ingest + D-2 schema docs per the V1 completion plan). Plan: `docs/plans/engineering-v1-completion-plan.md`. Resume map: `docs/plans/v1-resume-state.md`.
 - **last_nightly_pipeline**: `2026-04-28T03:00:30Z` — harness 20/20, triage promoted=1 rejected=1 human=0
-- **open_branches**: `claude/wave1-dashboard-counts-and-memory-fixes` (commit `fb4d55c`) — three memory-write-path bugs surfaced by Codex review; awaiting Codex audit before merge/deploy.
+- **open_branches**: none. Wave 1 (`4c70756`), Wave 1.5 (`b69d2c7`), and V1-A (`23cdb31`) all squash-merged and deployed today; branches cleaned up.
 
 ## Active Plan
 
@@ -170,6 +170,18 @@ One branch `codex/extractor-eval-loop` for Day 1-5, a second `codex/retrieval-ha
 
 ## Session Log
 
+- **2026-04-29 Codex + Claude (V1-A landed and deployed)** Engineering V1 Completion Plan Phase V1-A done. Branch `claude/v1-a-pillar-query-slice` shipped the Q-001 subsystem-scoped shape fix exactly per `engineering-query-catalog.md:71`: new `subsystem_contents()` helper in `queries.py` walking inbound `part_of` edges, new `GET /entities/Subsystem/{id}?expand=contains` route returning `{subsystem, contains: [{id, type, entity_type, name, status}]}`, dual-emit of `type` (spec) and `entity_type` (rest-of-module convention) for compat. The existing project-wide `/engineering/projects/{name}/systems` route stays for Q-004. Aliased under `/v1`. V1-A acceptance integration test runs all four pillar queries (Q-001 subsystem, Q-005 requirements_for, Q-006 orphan_requirements, Q-017 evidence_chain) plus Q-009/Q-011 against a single p05-interferometer seed graph. Codex audited at `b575773` (GO WITH CONDITIONS, two P2s + two P3s) → all four amends folded in at `0e83525` → re-review GO. Squash-merged to main as `23cdb31`. Deployed via canonical script; live `/health` build_sha `23cdb3149fde2185f0eaf1350c5b065b08f80319`, build_time `2026-04-29T17:04:05Z`, status=ok. **Live post-deploy probes** all green: `/entities/Subsystem/{p05-id}?expand=contains` → 200, spec-shaped response; `/v1/entities/Subsystem/{p05-id}?expand=contains` → 200; `?expand=parents` → 400 with informative detail; component-id against the Subsystem route → 404 with informative detail. Live retrieval harness 20/20 against `23cdb31`. Tests on main: 596 → 605 (+9). master-plan-status.md V1-A status flipped to ✅; V1-B is now "next".
+
+- **2026-04-29 Antoine + Claude (openclaw registered, proposals queue drained)** Talked through the framing tension — openclaw is "a tool" but external (we don't own its product), so the 17 memories are really integration notes (plugin architecture, `cleanedBody` hook field, read-only pull contract, hermes-agent comparison, atocore-capture v0.2.0 plugin). Picked Option A from the four options laid out: register `openclaw` straight (zero migration) with description that names the integration framing explicitly. Aliases: `clawd` (matches local repo path on Dalidou + T420). POSTed to `/admin/projects/register-emerging`. Live `/admin/projects/proposals?min_active=10` now returns count=0 — registered project set is 8, no unregistered labels above threshold. Wave 1.5 closed end-to-end: code + audit + deploy + both registrations.
+
+- **2026-04-29 Antoine + Claude (apm registered)** Antoine confirmed apm is a product alongside atomizer-v2 (I03 in the Atomaste tools I-series). Registered via `POST /admin/projects/register-emerging` mirroring atomizer-v2's pattern: aliases `i03`, `atomaste-parts-manager`, `parts-manager`; description "Atomaste Parts Manager — parts/COTS lifecycle tool (I03 in Atomaste tool series alongside I01 Atomizer-v2 and I02 AtoCore)". Default ingest_root `vault:incoming/projects/apm/` (does not yet exist on disk; may want a `/repo` mirror via PUT /projects/apm if a code repo gets staged, like atomizer-v2's `incoming/projects/atomizer-v2/repo`). Live `/admin/projects/proposals?min_active=10` post-registration: count drops 2→1 (apm gone, openclaw remains). 165 active + 22 candidate apm-tagged memories now resolve to a registered canonical id.
+
+- **2026-04-29 Codex + Claude (Wave 1.5 audited, merged, deployed)** Branch `claude/wave1.5-emerging-project-proposals` shipped `GET /admin/projects/proposals?min_active=N` — live, on-demand companion to the nightly `scripts/detect_emerging.py` cache. Each proposal includes project_id, active+candidate counts, sample_memories (3 most recent), suggested_aliases (sibling labels sharing a >=4-char token, case-insensitive), guessed_ingest_root. New `propose_emerging_projects()` helper in `service.py`. Codex audited tip `e8ac8bb`: verdict GO with one P2 (test was trivially true) and one P3 (case-sensitive tokens). Both folded into `f70fa6b` plus a registered-token-leak guard test. Tip `f70fa6b` squash-merged to main as `b69d2c7`. Deployed via canonical script; live `/health` reports build_sha `b69d2c70881b661e6fd8f25194cbc5c20a3947be`, build_time `2026-04-29T02:16:25Z`, status=ok. Live `/admin/projects/proposals?min_active=10` returns the expected 2 proposals: **apm (165 active / 22 candidate, no aliases)** and **openclaw (17 active / 0 candidate, no aliases)**. Hydrotech and lead-space variants below threshold or fewer captures than the dashboard `by_project` showed pre-deploy (live SQL is current). apm sample memories are clearly real APM project content (parts manager, McMaster cleanup workflows). Tests: 586 → 596 (+10). Branches deleted local + remote. **Open Wave 1.5 follow-on (P2)**: Codex recommended a one-step shortcut so the operator doesn't have to copy `suggested_aliases` from the proposal JSON into the register-emerging POST — e.g., `POST /admin/projects/register-emerging` with `from_proposal: {project_id}` that reads server-side. Deferred — the JSON copy is acceptable for the small number of projects in flight. Next: register apm (operator decision pending).
+
+- **2026-04-29 Claude (Wave 1 deployed, post-deploy probes green)** Squash-merged `claude/wave1-dashboard-counts-and-memory-fixes` (tip `9604c3e`) to main as `4c70756` after Codex's GO verdict on the amended branch. Pushed main, deployed via `ssh papa@dalidou "bash /srv/storage/atocore/app/deploy/dalidou/deploy.sh"`. Live `/health` reports build_sha `4c7075650c8187473bc5992b306fb8fa67542074`, build_time `2026-04-29T01:58:59Z`, status=ok. **Post-deploy acceptance** per Codex's checklist: (1) `/admin/dashboard memories.active = 1170` — was 315 pre-deploy, sampling bug closed; new fields `memories.total = 2436`, `memories.by_status` and full `memories.by_project` breakdown live; integrity panel still reports the 22h-old 1091 snapshot from last nightly which is expected behavior. (2) Live retrieval harness 20/20 PASS against `4c70756`, no regression. (3) Supersede/invalidate route branches probed live: unknown id → 404; candidate target → 409 with status-specific detail (`...is candidate; only active memories can be superseded`, `...is candidate; use /reject for candidates`). (4) Auto-triage suggested-project correction path covered by the script-source invariant test plus end-to-end TestClient coverage of the new `MemoryUpdateRequest.project` plumbing — not exercised against live prod state to avoid casual mutation. **Live by-project dashboard breakdown** revealed 14 unregistered projects accumulating memories: apm (165!), openclaw (17), hydrotech-mining variants (13), lead-space variants (5), and ten others. apm is severely overdue. Wave 1.5 starts next: one-click registration proposal endpoint with sample-memory + alias suggestions. **Test count**: 586 on main. **Open branches**: none — Wave 1 closed.
+
+- **2026-04-29 Codex + Claude (Wave 1 formal audit closed + amends)** Codex's formal audit of `fb4d55c` (Wave 1 first commit on `claude/wave1-dashboard-counts-and-memory-fixes`): verdict GO WITH CONDITIONS. Two P1-prior closures confirmed (dashboard count bug + invalidate top-1 lookup). Project-update P2 was only "partially closed" — API/service plumbing fine, but `scripts/auto_triage.py:417` still PUT `{"content": cand["content"]}` so the operational suggested-project correction was unreachable even with `MemoryUpdateRequest.project` in place. Codex also flagged the symmetric supersede-route gap as same-class adjacent surface and recommended pulling it in here, not in Wave 1.5. Plus one P3: cover retarget-to-empty-project against a global active duplicate. Amended on `3a474f7`: (1) auto_triage PUT body now `{"project": suggested}` with a guard test that lints the script source for the new shape; (2) `/memory/{id}/supersede` mirrors the invalidate guard via `get_memory(id)` — 404 unknown / 200 already_superseded / 409 wrong-status / 200 superseded; (3) regression test for project-empty duplicate detection. Test count 581 → 586. Codex's recommended deployment checklist (post-deploy verifications, including the run-or-simulate auto-triage retarget probe) carried into the merge plan. Awaiting Codex re-review of the amended tip before squash-merge.
+
 - **2026-04-29 Claude (Wave 1 debt-pay started; Codex review of state-of-service plan)** Audited live state on Dalidou: `/health` build_sha `7042eae` (4d old), harness 20/20, 33,253 vectors, 1,748 docs, 1054 interactions (+103/4d), dashboard memories.active=315 vs integrity.active_memory_count=1091. Drafted a state-of-service assessment + Wave 1/2/3/4 plan, then asked Codex (gpt-5.5) for an adversarial review via `codex exec`. Codex verdict: assessment MIXED, plan ENDORSE WITH CHANGES. Codex caught two factual corrections (the 315-vs-1091 gap is a *sampling bug* not a definitional gap; my "R9 drops unregistered tags" framing is wrong — `extractor_llm.py:213-233` preserves them) and two new memory-write-path bugs I missed. Branched `claude/wave1-dashboard-counts-and-memory-fixes` from `7042eae`, fixed all three: (1) `/admin/dashboard` now uses a new `get_memory_count_summary()` SQL aggregate helper instead of counting inside a confidence-sorted `get_memories(limit=500)` sample; (2) `MemoryUpdateRequest` and `update_memory()` accept `project` with `resolve_project_name` canonicalization + before/after audit, so `auto_triage.py:407` suggested-project corrections will now actually apply; (3) `POST /memory/{id}/invalidate` replaces the `_get_memories(status="active", limit=1)` lookup (which only saw the highest-confidence active row) with a direct id lookup via new `get_memory(id)` helper. 9 regression tests added across `test_memory.py` and `test_invalidate_supersede.py`. Full local suite: 581 passed (572 → 581). Commit `fb4d55c`. Branch not pushed/deployed yet — awaiting Codex audit per working model. Refreshed Orientation block (live_sha, last_updated, test_count, memory counts, capture cadence, registered/unregistered project breakdown, open_branches). Wave 1 follow-up still open: (W1.2) one-click registration proposal for unregistered projects with ≥10 active memories (apm=63 is overdue); (W1.3 done by this entry) sync ledger; (W1.4) committed measurable-win probe fixture+JSON output. After this branch lands, V1-A is unblocked: gates have effectively cleared (soak ended 2026-04-26; density 315 ≫ 100 target).
 
 - **2026-04-25 Codex (p04 constraint gap closed; harness fully green)** Root-caused the remaining `p04-constraints` fixture: the `Zerodur` / `1.2` fact already existed in Trusted Project State (`requirement/key_constraints`), but project-state formatting was category/key ordered and then truncated to the 20% state budget, so contacts/decisions consumed the budget before the relevant requirement. Added query-relevance ranking for Trusted Project State entries before formatting/truncation, with regression coverage in `test_project_state_query_relevance_before_truncation`. Removed the fixture's `known_issue` lane so future p04 constraint regressions are blocking. Cleaned up a duplicate live requirement entry created during diagnosis by invalidating `requirement/mirror-blank-core-constraints`; canonical `requirement/key_constraints` remains active. Verified focused suite: 35 passed. Verified full local suite: 572 passed. Deployed `d3de9f67eaa08dfc5b2d86e8221b8c70fef266d3`; live exact p04 probe now surfaces `[REQUIREMENT] key_constraints` with `1.2` and `Zerodur`. Live retrieval harness: 20/20, 0 known issues, 0 blocking failures.

docs/master-plan-status.md

@@ -198,8 +198,8 @@ where surfaces are disjoint, pauses when they collide.
 | Phase | Scope | Status |
 |---|---|---|
 | V1-0 | Write-time invariants: F-1 header fields + F-8 provenance enforcement + F-5 hook on every active-entity write + Q-3 flag-never-block | ✅ done 2026-04-22 (`2712c5d`) |
-| V1-A | Minimum query slice: Q-001 subsystem-scoped variant + Q-6 killer-correctness integration test on p05-interferometer | 🟡 gated — starts when soak (~2026-04-26) + density (100+ active memories) gates clear |
-| V1-B | KB-CAD + KB-FEM ingest (`POST /ingest/kb-cad/export`, `POST /ingest/kb-fem/export`) + D-2 schema docs | pending V1-A |
+| V1-A | Minimum query slice: Q-001 subsystem-scoped variant + Q-6 killer-correctness integration test on p05-interferometer | ✅ done 2026-04-29 (`23cdb31`) |
+| V1-B | KB-CAD + KB-FEM ingest (`POST /ingest/kb-cad/export`, `POST /ingest/kb-fem/export`) + D-2 schema docs | next |
 | V1-C | Close the remaining 8 queries (Q-002/003/007/010/012/014/018/019; Q-020 to V1-D) | pending V1-B |
 | V1-D | Full mirror surface (3 spec routes + regenerate + determinism + disputed + curated markers) + Q-5 golden file | pending V1-C |
 | V1-E | Memory→entity graduation end-to-end + remaining Q-4 trust tests | pending V1-D (note: collides with memory extractor; pauses for multi-model triage work) |

scripts/auto_triage.py

@@ -404,19 +404,23 @@ def process_candidate(cand, base_url, active_cache, state_cache, known_projects,
         known_projects, TIER1_MODEL, DEFAULT_TIMEOUT_S,
     )
 
-    # Project misattribution fix: suggested_project surfaces from tier 1
+    # Project misattribution fix: suggested_project surfaces from tier 1.
+    # Earlier code POSTed only {"content": cand["content"]}, which left
+    # the project field unchanged because MemoryUpdateRequest had no
+    # project key and the service signature didn't accept one. Wave 1
+    # added project to MemoryUpdateRequest and update_memory(); this
+    # caller now actually applies the suggested project.
     suggested = (v1.get("suggested_project") or "").strip()
     if suggested and suggested != project and suggested in known_projects:
-        # Try to re-canonicalize the memory's project
         if not dry_run:
             try:
                 import urllib.request as _ur
                 req = _ur.Request(
                     f"{base_url}/memory/{mid}", method="PUT",
                     headers={"Content-Type": "application/json"},
-                    data=json.dumps({"content": cand["content"]}).encode("utf-8"),
+                    data=json.dumps({"project": suggested}).encode("utf-8"),
                 )
-                _ur.urlopen(req, timeout=10).read()  # triggers canonicalization via update
+                _ur.urlopen(req, timeout=10).read()
             except Exception:
                 pass
         print(f"    ↺ misattribution flagged: {project!r} → {suggested!r}")

src/atocore/api/routes.py

@@ -474,6 +474,33 @@ def api_register_emerging_project(req: RegisterEmergingRequest) -> dict:
     return result
 
 
+@router.get("/admin/projects/proposals")
+def api_project_proposals(min_active: int = 10) -> dict:
+    """Live registration proposals for unregistered projects.
+
+    Reads SQL + the registry directly, so the result is current — unlike
+    `/admin/dashboard.proposals.unregistered_projects` which is the
+    nightly cache from `scripts/detect_emerging.py`. Each proposal
+    includes a guessed ingest root, sibling labels suggested as aliases,
+    and a few sample memories so the operator can sanity-check before
+    POSTing to /admin/projects/register-emerging.
+
+    Query params:
+        min_active: minimum active-memory count for a label to surface
+                    (default 10).
+    """
+    from atocore.memory.service import propose_emerging_projects
+
+    if min_active < 1:
+        raise HTTPException(status_code=400, detail="min_active must be >= 1")
+    proposals = propose_emerging_projects(min_active=min_active)
+    return {
+        "proposals": proposals,
+        "count": len(proposals),
+        "min_active": min_active,
+    }
+
+
 @router.put("/projects/{project_name}")
 def api_project_update(project_name: str, req: ProjectUpdateRequest) -> dict:
     """Update an existing project registration."""
@@ -827,15 +854,33 @@ def api_supersede_memory(
     memory_id: str,
     req: MemorySupersedeRequest | None = None,
 ) -> dict:
-    """Supersede an active memory (Issue E — active → superseded)."""
-    from atocore.memory.service import supersede_memory
+    """Supersede an active memory (Issue E — active → superseded).
+
+    Mirrors the invalidate route's status guard: candidates and other
+    non-active rows must not silently flip to superseded.
+    """
+    from atocore.memory.service import get_memory, supersede_memory
 
     reason = req.reason if req else ""
+    target = get_memory(memory_id)
+    if target is None:
+        raise HTTPException(status_code=404, detail=f"Memory not found: {memory_id}")
+    if target.status == "superseded":
+        return {"status": "already_superseded", "id": memory_id}
+    if target.status != "active":
+        raise HTTPException(
+            status_code=409,
+            detail=(
+                f"Memory {memory_id} is {target.status}; "
+                "only active memories can be superseded"
+            ),
+        )
+
     success = supersede_memory(memory_id, actor="api-http", reason=reason)
     if not success:
         raise HTTPException(
-            status_code=404,
-            detail=f"Memory not found or not active: {memory_id}",
+            status_code=409,
+            detail=f"Memory {memory_id} could not be superseded",
         )
     return {"status": "superseded", "id": memory_id}
 
@@ -2348,6 +2393,41 @@ def api_entity_audit(entity_id: str, limit: int = 100) -> dict:
     return {"entity_id": entity_id, "entries": entries, "count": len(entries)}
 
 
+@router.get("/entities/Subsystem/{subsystem_id}")
+def api_subsystem_contents(subsystem_id: str, expand: str = "contains") -> dict:
+    """Q-001 (subsystem-scoped variant) — the spec-shaped invocation.
+
+    Per ``docs/architecture/engineering-query-catalog.md`` Q-001:
+        ``GET /entities/Subsystem/<id>?expand=contains``
+        → ``{ subsystem, contains: [{ id, type, name, status }] }``
+
+    Distinct from the project-wide tree at
+    ``GET /engineering/projects/{name}/systems`` (Q-004), which stays
+    as-is. V1-A only adds this single shape fix; broader query catalog
+    closure is V1-C.
+
+    ``expand`` is currently restricted to ``"contains"``; other expand
+    facets (Q-007 ``constraints``, Q-008 ``decisions``) land in V1-C.
+    """
+    if expand != "contains":
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                f"unsupported expand={expand!r} for /entities/Subsystem; "
+                "V1-A supports only 'contains'."
+            ),
+        )
+    from atocore.engineering.queries import subsystem_contents
+
+    result = subsystem_contents(subsystem_id)
+    if result is None:
+        raise HTTPException(
+            status_code=404,
+            detail=f"Subsystem not found or not a subsystem: {subsystem_id}",
+        )
+    return result
+
+
 @router.get("/entities/{entity_id}")
 def api_get_entity(entity_id: str) -> dict:
     """Get an entity with its relationships and related entities."""

src/atocore/engineering/queries.py

@@ -118,6 +118,70 @@ def system_map(project: str) -> dict:
     return out
 
 
+def subsystem_contents(subsystem_id: str) -> dict | None:
+    """Q-001 subsystem-scoped variant: a single subsystem and its
+    direct ``CONTAINS`` children.
+
+    Spec: ``GET /entities/Subsystem/<id>?expand=contains`` per
+    ``docs/architecture/engineering-query-catalog.md`` Q-001.
+
+    Differs from :func:`system_map` (Q-004) which returns the
+    project-wide tree. The subsystem-scoped form is what individual
+    operator queries actually need: "what's inside this one subsystem?"
+    rather than "show me the whole project."
+
+    The relationship walk uses inbound ``part_of`` edges (the inverse
+    of ``CONTAINS``) so both child Components and child Subsystems
+    surface uniformly. Filters to active children only — superseded
+    or invalid rows do not belong in a "current contents" answer.
+
+    Returns:
+        ``{"subsystem": {id, name, project, status, description},
+           "contains": [{id, entity_type, name, status}]}``
+        or ``None`` when the entity does not exist or is not a subsystem.
+    """
+    with get_connection() as conn:
+        ss = conn.execute(
+            "SELECT * FROM entities WHERE id = ?",
+            (subsystem_id,),
+        ).fetchone()
+        if ss is None or ss["entity_type"] != "subsystem":
+            return None
+        rows = conn.execute(
+            "SELECT e.id, e.entity_type, e.name, e.status "
+            "FROM relationships r "
+            "JOIN entities e ON e.id = r.source_entity_id "
+            "WHERE r.relationship_type = 'part_of' "
+            "AND r.target_entity_id = ? "
+            "AND e.status = 'active' "
+            "ORDER BY e.entity_type, e.name",
+            (subsystem_id,),
+        ).fetchall()
+
+    return {
+        "subsystem": {
+            "id": ss["id"],
+            "name": ss["name"],
+            "project": ss["project"],
+            "status": ss["status"],
+            "description": ss["description"] or "",
+        },
+        "contains": [
+            {
+                "id": r["id"],
+                # V1-A spec uses `type` per engineering-query-catalog.md Q-001;
+                # `entity_type` is duplicated for parity with the rest of
+                # this module's response shape (see `_entity_dict`).
+                "type": r["entity_type"],
+                "entity_type": r["entity_type"],
+                "name": r["name"],
+                "status": r["status"],
+            }
+            for r in rows
+        ],
+    }
+
+
 def decisions_affecting(project: str, subsystem_id: str | None = None) -> dict:
     """Q-008: decisions that affect a subsystem (or whole project).
 

src/atocore/main.py

@@ -66,6 +66,8 @@ _V1_PUBLIC_PATHS = {
     "/entities/{entity_id}/invalidate",
     "/entities/{entity_id}/supersede",
     "/entities/{entity_id}/audit",
+    # V1-A: Q-001 subsystem-scoped variant per engineering-query-catalog
+    "/entities/Subsystem/{subsystem_id}",
     "/relationships",
     "/ingest",
     "/ingest/sources",

src/atocore/memory/service.py

@@ -424,6 +424,126 @@ def get_memory_count_summary() -> dict:
     return summary
 
 
+def propose_emerging_projects(min_active: int = 10) -> list[dict]:
+    """Return live, on-demand registration proposals for unregistered projects.
+
+    Differs from the nightly ``scripts/detect_emerging.py`` cache (which
+    is fresh once a day and lives in ``project_state.proposals``) by
+    reading current SQL and the registry directly. Each proposal is
+    operator-ready: a guessed ingest root, sibling labels suggested as
+    aliases, and a few sample memories so the operator can sanity-check
+    the bucket before committing it.
+
+    Args:
+        min_active: minimum number of active memories required for a
+            label to surface as a proposal. Defaults to 10 — anything
+            smaller is too noisy to register without more signal.
+
+    Returns:
+        list of proposal dicts, sorted by active_count desc:
+            {
+                "project_id": str,
+                "active_count": int,
+                "candidate_count": int,
+                "suggested_aliases": list[str],
+                "guessed_ingest_root": {"source": "vault", "subpath": ...},
+                "sample_memories": [{id, content_preview, updated_at}, ...],
+            }
+    """
+    from atocore.projects.registry import load_project_registry
+
+    # Build the set of names already known to the registry (canonical + aliases),
+    # lowercased. Anything in this set is "registered" and not a proposal.
+    registered_names: set[str] = set()
+    try:
+        for project in load_project_registry():
+            registered_names.add(project.project_id.lower())
+            for alias in project.aliases:
+                registered_names.add(alias.lower())
+    except Exception:
+        # Fail-open: if the registry can't load, assume nothing is
+        # registered and let the proposal surface everything.
+        pass
+
+    with get_connection() as conn:
+        # Active counts per project (excluding empty/null project — that's
+        # the global bucket, not a proposal candidate).
+        active_rows = conn.execute(
+            "SELECT project, count(*) AS c FROM memories "
+            "WHERE status = 'active' AND project IS NOT NULL AND project != '' "
+            "GROUP BY project"
+        ).fetchall()
+        cand_rows = conn.execute(
+            "SELECT project, count(*) AS c FROM memories "
+            "WHERE status = 'candidate' AND project IS NOT NULL AND project != '' "
+            "GROUP BY project"
+        ).fetchall()
+
+    cand_counts = {r["project"]: r["c"] for r in cand_rows}
+
+    # Filter to unregistered labels above threshold
+    unregistered: list[tuple[str, int, int]] = []  # (project, active_n, candidate_n)
+    for r in active_rows:
+        proj = r["project"]
+        if proj.lower() in registered_names:
+            continue
+        if r["c"] < min_active:
+            continue
+        unregistered.append((proj, r["c"], cand_counts.get(proj, 0)))
+
+    # Sibling alias detection: two unregistered labels are siblings if
+    # they share a non-trivial token (length >= 4 after splitting on
+    # '-' and '_'). Cheap, defensible, and the operator gets to veto.
+    def _tokens(label: str) -> set[str]:
+        parts = label.lower().replace("_", "-").split("-")
+        return {p for p in parts if len(p) >= 4}
+
+    label_tokens = {label: _tokens(label) for label, _a, _c in unregistered}
+
+    proposals = []
+    for proj, active_n, candidate_n in sorted(
+        unregistered, key=lambda t: (-t[1], t[0])
+    ):
+        siblings = [
+            other
+            for other in label_tokens
+            if other != proj and (label_tokens[proj] & label_tokens[other])
+        ]
+        siblings.sort()
+
+        # Sample memories: top 3 active by updated_at desc
+        with get_connection() as conn:
+            sample_rows = conn.execute(
+                "SELECT id, content, updated_at FROM memories "
+                "WHERE status = 'active' AND project = ? "
+                "ORDER BY updated_at DESC LIMIT 3",
+                (proj,),
+            ).fetchall()
+        samples = [
+            {
+                "id": r["id"],
+                "content_preview": (r["content"] or "")[:160],
+                "updated_at": r["updated_at"],
+            }
+            for r in sample_rows
+        ]
+
+        proposals.append(
+            {
+                "project_id": proj,
+                "active_count": active_n,
+                "candidate_count": candidate_n,
+                "suggested_aliases": siblings,
+                "guessed_ingest_root": {
+                    "source": "vault",
+                    "subpath": f"incoming/projects/{proj}/",
+                },
+                "sample_memories": samples,
+            }
+        )
+    return proposals
+
+
 def update_memory(
     memory_id: str,
     content: str | None = None,

tests/test_emerging_project_proposals.py

@@ -0,0 +1,217 @@
+"""Wave 1.5 — live emerging-project registration proposals.
+
+The nightly `scripts/detect_emerging.py` writes a stale cache to
+`project_state.proposals.unregistered_projects`. This endpoint provides
+the on-demand alternative that operators can hit before deciding which
+unregistered project to register via `/admin/projects/register-emerging`.
+"""
+
+import json
+
+import pytest
+from fastapi.testclient import TestClient
+
+import atocore.config as config
+from atocore.main import app
+from atocore.memory.service import create_memory
+from atocore.models.database import init_db
+
+
+@pytest.fixture
+def env(tmp_data_dir, tmp_path, monkeypatch):
+    """Fresh DB + a registry holding a single registered project so we
+    can prove the proposals endpoint excludes registered names."""
+    registry_path = tmp_path / "registry.json"
+    registry_path.write_text(
+        json.dumps(
+            {
+                "projects": [
+                    {
+                        "id": "p04-gigabit",
+                        "aliases": ["p04", "gigabit"],
+                        "description": "test",
+                        "ingest_roots": [
+                            {"source": "vault", "subpath": "incoming/projects/p04-gigabit"}
+                        ],
+                    }
+                ]
+            }
+        ),
+        encoding="utf-8",
+    )
+    monkeypatch.setenv("ATOCORE_PROJECT_REGISTRY_PATH", str(registry_path))
+    config.settings = config.Settings()
+    init_db()
+    yield tmp_data_dir
+
+
+def test_proposals_excludes_registered_project_and_its_aliases(env):
+    """Memories tagged on a registered canonical id or any of its
+    aliases must not appear as a registration proposal."""
+    # Registered: p04-gigabit (aliases p04, gigabit)
+    for i in range(15):
+        create_memory("knowledge", f"p04 fact {i}", project="p04-gigabit")
+    for i in range(15):
+        create_memory("knowledge", f"alias fact {i}", project="p04")  # alias
+
+    # Unregistered, above threshold
+    for i in range(12):
+        create_memory("knowledge", f"apm fact {i}", project="apm")
+
+    client = TestClient(app)
+    body = client.get("/admin/projects/proposals?min_active=10").json()
+    ids = [p["project_id"] for p in body["proposals"]]
+    assert "apm" in ids
+    assert "p04-gigabit" not in ids
+    assert "p04" not in ids
+    assert "gigabit" not in ids
+
+
+def test_proposals_threshold_filters_low_count_labels(env):
+    create_memory("knowledge", "single one-off", project="discrawl")
+    for i in range(3):
+        create_memory("knowledge", f"low-volume {i}", project="drill")
+    for i in range(11):
+        create_memory("knowledge", f"high-volume {i}", project="apm")
+
+    client = TestClient(app)
+    proposals = client.get("/admin/projects/proposals?min_active=10").json()["proposals"]
+    ids = [p["project_id"] for p in proposals]
+    assert "apm" in ids
+    assert "drill" not in ids
+    assert "discrawl" not in ids
+
+
+def test_proposals_suggest_sibling_aliases_via_shared_tokens(env):
+    """Lead-space + lead-space-exploration-ltd + space-exploration-ltd
+    should cluster: each proposes the others as suggested_aliases via
+    shared non-trivial tokens (length >= 4)."""
+    for label in ("lead-space", "lead-space-exploration-ltd", "space-exploration-ltd"):
+        for i in range(11):
+            create_memory("knowledge", f"{label} content {i}", project=label)
+
+    client = TestClient(app)
+    proposals = {p["project_id"]: p for p in client.get("/admin/projects/proposals").json()["proposals"]}
+
+    # All three appear and each suggests at least one of the others
+    for label in ("lead-space", "lead-space-exploration-ltd", "space-exploration-ltd"):
+        assert label in proposals
+        siblings = set(proposals[label]["suggested_aliases"])
+        # Every label shares "space" (and others share "exploration"/"lead")
+        # so at least one sibling must be present.
+        assert siblings & {"lead-space", "lead-space-exploration-ltd", "space-exploration-ltd"} - {label}
+
+
+def test_proposals_short_token_does_not_match(env):
+    """Per Codex Wave 1.5 P2: previously this test only asserted apm
+    and drill have empty siblings, which is trivially true because they
+    share no tokens at all. The real risk is an accidental relaxation
+    that lets <4-char tokens trigger clustering. Construct a setup where
+    that would matter:
+      - 'apm' and 'apm-fpga': only the 3-char 'apm' is shared. They must
+        NOT cluster, because 'apm' is too short.
+      - 'foo-fpga' and 'bar-fpga': the 4-char 'fpga' is shared. They
+        MUST cluster.
+    """
+    for label in ("apm", "apm-fpga", "foo-fpga", "bar-fpga"):
+        for i in range(11):
+            create_memory("knowledge", f"{label} fact {i}", project=label)
+
+    client = TestClient(app)
+    proposals = {p["project_id"]: p for p in client.get("/admin/projects/proposals").json()["proposals"]}
+
+    # Negative: short-token match must not happen
+    assert "apm-fpga" not in proposals["apm"]["suggested_aliases"], (
+        "'apm' (3 chars) is below the 4-char minimum; 'apm' and 'apm-fpga' "
+        "must not cluster via the 'apm' token."
+    )
+
+    # Positive: long-token match must happen — both directions
+    assert "bar-fpga" in proposals["foo-fpga"]["suggested_aliases"]
+    assert "foo-fpga" in proposals["bar-fpga"]["suggested_aliases"]
+    # And 'apm-fpga' clusters with the others via 'fpga'
+    assert "apm-fpga" in proposals["foo-fpga"]["suggested_aliases"]
+
+
+def test_proposals_clustering_is_case_insensitive(env):
+    """Token comparison must be case-insensitive so labels captured
+    with mixed casing still cluster. Codex Wave 1.5 P3."""
+    for label in ("HydroTech-Mining", "hydrotech-split-tank"):
+        for i in range(11):
+            create_memory("knowledge", f"{label} fact {i}", project=label)
+
+    client = TestClient(app)
+    proposals = {p["project_id"]: p for p in client.get("/admin/projects/proposals").json()["proposals"]}
+    assert "hydrotech-split-tank" in proposals["HydroTech-Mining"]["suggested_aliases"]
+    assert "HydroTech-Mining" in proposals["hydrotech-split-tank"]["suggested_aliases"]
+
+
+def test_proposals_registered_token_does_not_leak_into_sibling_set(env, monkeypatch):
+    """Registered project ids must be filtered BEFORE clustering so a
+    registered token doesn't get suggested as an alias for an
+    unregistered sibling. p04-gigabit is registered in env; an
+    unregistered 'gigabit-other' must not list 'p04-gigabit' as alias."""
+    for i in range(15):
+        create_memory("knowledge", f"p04 fact {i}", project="p04-gigabit")
+    for i in range(11):
+        create_memory("knowledge", f"gigabit-other fact {i}", project="gigabit-other")
+
+    client = TestClient(app)
+    proposals = {p["project_id"]: p for p in client.get("/admin/projects/proposals").json()["proposals"]}
+    assert "p04-gigabit" not in proposals
+    assert "gigabit-other" in proposals
+    # And the registered name must not surface as a sibling
+    assert "p04-gigabit" not in proposals["gigabit-other"]["suggested_aliases"]
+
+
+def test_proposals_include_sample_memories_and_guessed_root(env):
+    for i in range(11):
+        create_memory("knowledge", f"sample content {i}", project="apm")
+
+    client = TestClient(app)
+    body = client.get("/admin/projects/proposals").json()
+    apm = next(p for p in body["proposals"] if p["project_id"] == "apm")
+    assert apm["active_count"] == 11
+    assert apm["candidate_count"] == 0
+    assert apm["guessed_ingest_root"] == {
+        "source": "vault",
+        "subpath": "incoming/projects/apm/",
+    }
+    assert len(apm["sample_memories"]) == 3
+    for s in apm["sample_memories"]:
+        assert s["id"]
+        assert "sample content" in s["content_preview"]
+
+
+def test_proposals_count_candidates_separately(env):
+    for i in range(11):
+        create_memory("knowledge", f"active {i}", project="apm")
+    for i in range(4):
+        create_memory("knowledge", f"candidate {i}", project="apm", status="candidate")
+
+    client = TestClient(app)
+    apm = next(
+        p for p in client.get("/admin/projects/proposals").json()["proposals"]
+        if p["project_id"] == "apm"
+    )
+    assert apm["active_count"] == 11
+    assert apm["candidate_count"] == 4
+
+
+def test_proposals_min_active_param_validation(env):
+    client = TestClient(app)
+    r = client.get("/admin/projects/proposals?min_active=0")
+    assert r.status_code == 400
+
+
+def test_proposals_sorted_by_active_count_desc(env):
+    for i in range(20):
+        create_memory("knowledge", f"big {i}", project="apm")
+    for i in range(11):
+        create_memory("knowledge", f"small {i}", project="openclaw")
+
+    client = TestClient(app)
+    proposals = client.get("/admin/projects/proposals").json()["proposals"]
+    ids = [p["project_id"] for p in proposals]
+    assert ids[0] == "apm"
+    assert ids[1] == "openclaw"

tests/test_invalidate_supersede.py

@@ -249,6 +249,35 @@ def test_api_invalidate_unknown_id_is_404(env):
     assert r.status_code == 404
 
 
+def test_api_supersede_candidate_returns_409(env):
+    """Mirror of the invalidate guard: candidates must not silently flip
+    to superseded via the active-only supersede route."""
+    m = create_memory(
+        memory_type="knowledge", content="candidate target", status="candidate"
+    )
+    client = TestClient(app)
+    r = client.post(f"/memory/{m.id}/supersede", json={"reason": "wrong route"})
+    assert r.status_code == 409
+    # Row should still be a candidate
+    assert _get_memory(m.id).status == "candidate"
+
+
+def test_api_supersede_already_superseded_is_idempotent(env):
+    m = create_memory(memory_type="knowledge", content="will be superseded")
+    client = TestClient(app)
+    r1 = client.post(f"/memory/{m.id}/supersede", json={"reason": "first"})
+    assert r1.status_code == 200
+    r2 = client.post(f"/memory/{m.id}/supersede", json={"reason": "again"})
+    assert r2.status_code == 200
+    assert r2.json()["status"] == "already_superseded"
+
+
+def test_api_supersede_unknown_id_is_404(env):
+    client = TestClient(app)
+    r = client.post("/memory/no-such-id/supersede", json={"reason": "ghost"})
+    assert r.status_code == 404
+
+
 def test_admin_dashboard_active_count_matches_full_table(env):
     """/admin/dashboard memories.active must match the SQL aggregate even
     when there are more active memories than the legacy sample limit (500).

tests/test_memory.py

@@ -661,3 +661,35 @@ def test_update_memory_project_unchanged_when_not_passed(isolated_db):
     mem = create_memory("knowledge", "untouched project", project="p06-polisher")
     update_memory(mem.id, content="edited content")
     assert get_memory(mem.id).project == "p06-polisher"
+
+
+def test_update_memory_to_empty_project_detects_global_duplicate(isolated_db):
+    """Codex P3: when retargeting to project='' (global), the duplicate
+    check must scope to the new project. If a global active memory with
+    the same content already exists, the update must raise."""
+    import pytest as _pytest
+    from atocore.memory.service import create_memory, update_memory
+
+    create_memory("knowledge", "shared global fact", project="")
+    scoped = create_memory("knowledge", "shared global fact", project="p04-gigabit")
+
+    with _pytest.raises(ValueError, match="duplicate active memory"):
+        update_memory(scoped.id, project="")
+
+
+def test_auto_triage_suggested_project_put_body_uses_project_key():
+    """Regression: the auto_triage caller used to PUT {"content": ...}
+    which silently dropped the suggested project change. The fix sends
+    {"project": suggested}. Inspect the script source so we don't have
+    to spin up a live triage run."""
+    from pathlib import Path
+
+    src = Path(__file__).resolve().parents[1] / "scripts" / "auto_triage.py"
+    text = src.read_text(encoding="utf-8")
+    # The block that PUTs to /memory/{mid} for a suggested_project fix
+    assert 'json.dumps({"project": suggested})' in text, (
+        "auto_triage.py must PUT {\"project\": suggested} so the "
+        "suggested-project correction actually applies. See Wave 1."
+    )
+    # And must not be back to the old shape
+    assert 'json.dumps({"content": cand["content"]})' not in text

tests/test_v1_a_pillar_queries.py

@@ -0,0 +1,278 @@
+"""V1-A — minimum query slice that proves the entity model end-to-end.
+
+Per ``docs/plans/engineering-v1-completion-plan.md`` Phase V1-A:
+the four pillar queries (Q-001 subsystem-scoped, Q-005, Q-006, Q-017)
+must run against a single seed graph and report the expected shapes.
+
+This file is intentionally separate from ``test_engineering_queries.py``
+so the V1-A acceptance is auditable in isolation. The seed graph mirrors
+what the V1-A plan called for: one satisfying Component, one orphan
+Requirement, one supported ValidationClaim, one unsupported one, one
+Decision on a flagged Assumption.
+"""
+
+from __future__ import annotations
+
+import pytest
+from fastapi.testclient import TestClient
+
+from atocore.engineering.queries import (
+    evidence_chain,
+    orphan_requirements,
+    requirements_for,
+    risky_decisions,
+    subsystem_contents,
+    unsupported_claims,
+)
+from atocore.engineering.service import (
+    create_entity,
+    create_relationship,
+    init_engineering_schema,
+    invalidate_active_entity,
+)
+from atocore.main import app
+from atocore.models.database import init_db
+
+
+@pytest.fixture
+def v1a_seed(tmp_data_dir):
+    """Seed the Q-6 integration data exactly as V1-A's plan describes:
+    one satisfying Component + one orphan Requirement + one Decision on
+    a flagged Assumption + one supported ValidationClaim + one
+    unsupported ValidationClaim, plus the Subsystem they live under."""
+    init_db()
+    init_engineering_schema()
+
+    # Subsystem (Q-001 target)
+    optics = create_entity("subsystem", "Optics", project="p05-interferometer")
+
+    # Components — one with PART_OF the subsystem and SATISFIES a requirement,
+    # one without parents (orphan_components in Q-004; not the focus here).
+    primary = create_entity("component", "Primary Mirror", project="p05-interferometer")
+    diverger = create_entity("component", "Diverger Lens", project="p05-interferometer")
+    create_relationship(primary.id, optics.id, "part_of")
+    create_relationship(diverger.id, optics.id, "part_of")
+
+    # Requirements — one satisfied by primary, one orphan (Q-006)
+    req_satisfied = create_entity(
+        "requirement", "Surface figure < 25 nm RMS", project="p05-interferometer"
+    )
+    req_orphan = create_entity(
+        "requirement", "Calibration repeatable to lambda/20", project="p05-interferometer"
+    )
+    create_relationship(primary.id, req_satisfied.id, "satisfies")
+
+    # Decision on a flagged Assumption (Q-009 surface — not asserted in V1-A
+    # acceptance but useful as background data)
+    flagged_assumption = create_entity(
+        "parameter",
+        "Vendor lead time = 6 weeks",
+        project="p05-interferometer",
+        properties={"flagged": True},
+    )
+    risky = create_entity(
+        "decision", "Pre-order CGH from external vendor", project="p05-interferometer"
+    )
+    create_relationship(risky.id, flagged_assumption.id, "based_on_assumption")
+
+    # Validation claims — one supported by a Result, one unsupported (Q-017
+    # touches the supported one; Q-011 surfaces the unsupported one)
+    fea_result = create_entity(
+        "result", "FEA thermal sweep 2026-04", project="p05-interferometer"
+    )
+    claim_supported = create_entity(
+        "validation_claim", "Thermal margin is adequate", project="p05-interferometer"
+    )
+    claim_unsupported = create_entity(
+        "validation_claim", "Vibration isolation passes spec", project="p05-interferometer"
+    )
+    create_relationship(fea_result.id, claim_supported.id, "supports")
+
+    return {
+        "subsystem": optics,
+        "primary": primary,
+        "diverger": diverger,
+        "req_satisfied": req_satisfied,
+        "req_orphan": req_orphan,
+        "claim_supported": claim_supported,
+        "claim_unsupported": claim_unsupported,
+        "fea_result": fea_result,
+        "risky_decision": risky,
+        "flagged_assumption": flagged_assumption,
+    }
+
+
+# ---------------------------------------------------------------------------
+# Q-001 subsystem-scoped — the V1-A code change
+# ---------------------------------------------------------------------------
+
+
+def test_subsystem_contents_returns_spec_shape(v1a_seed):
+    """The shape must match the catalog spec
+    (engineering-query-catalog.md Q-001):
+    ``{subsystem, contains: [{id, type, name, status}]}``.
+    The implementation also emits ``entity_type`` for parity with the
+    rest of this module's response style — both must be present."""
+    result = subsystem_contents(v1a_seed["subsystem"].id)
+
+    assert result is not None
+    assert set(result.keys()) == {"subsystem", "contains"}
+    ss = result["subsystem"]
+    assert ss["id"] == v1a_seed["subsystem"].id
+    assert ss["name"] == "Optics"
+    assert ss["project"] == "p05-interferometer"
+    assert ss["status"] == "active"
+
+    contained = {c["name"] for c in result["contains"]}
+    assert contained == {"Primary Mirror", "Diverger Lens"}
+    for child in result["contains"]:
+        # Spec requires `type`; we also include `entity_type` for parity.
+        assert "type" in child
+        assert "entity_type" in child
+        assert child["type"] == child["entity_type"]
+        assert set(child.keys()) >= {"id", "type", "entity_type", "name", "status"}
+        assert child["entity_type"] == "component"
+        assert child["status"] == "active"
+
+
+def test_subsystem_contents_returns_none_for_missing_id(tmp_data_dir):
+    init_db()
+    init_engineering_schema()
+    assert subsystem_contents("no-such-id") is None
+
+
+def test_subsystem_contents_returns_none_when_entity_is_not_a_subsystem(v1a_seed):
+    """Calling the subsystem-scoped query against a Component must
+    return None, not the component dressed up as a subsystem."""
+    assert subsystem_contents(v1a_seed["primary"].id) is None
+
+
+def test_subsystem_contents_route_matches_spec(v1a_seed):
+    """Spec invocation: GET /entities/Subsystem/<id>?expand=contains.
+    Verify the route is registered, the expand=contains path works,
+    and unsupported expand values 400."""
+    client = TestClient(app)
+    sid = v1a_seed["subsystem"].id
+
+    r = client.get(f"/entities/Subsystem/{sid}?expand=contains")
+    assert r.status_code == 200
+    body = r.json()
+    assert body["subsystem"]["id"] == sid
+    names = {c["name"] for c in body["contains"]}
+    assert names == {"Primary Mirror", "Diverger Lens"}
+
+    # Default expand is "contains" so omitting the param should also work
+    r = client.get(f"/entities/Subsystem/{sid}")
+    assert r.status_code == 200
+
+    # Unsupported expand value 400s with an informative message
+    r = client.get(f"/entities/Subsystem/{sid}?expand=parents")
+    assert r.status_code == 400
+    assert "expand" in r.json()["detail"].lower()
+
+    # Missing/wrong-type subsystem 404s
+    r = client.get(f"/entities/Subsystem/{v1a_seed['primary'].id}")
+    assert r.status_code == 404
+
+
+def test_subsystem_contents_v1_alias_is_present():
+    """The subsystem-scoped variant must also be reachable under /v1."""
+    client = TestClient(app)
+    spec = client.get("/openapi.json").json()
+    assert "/v1/entities/Subsystem/{subsystem_id}" in spec["paths"]
+
+
+def test_subsystem_contents_v1_alias_serves_real_response(v1a_seed):
+    """Behavior, not just OpenAPI presence — catches a future
+    route-copy or ordering regression (Codex V1-A P3)."""
+    client = TestClient(app)
+    sid = v1a_seed["subsystem"].id
+
+    r = client.get(f"/v1/entities/Subsystem/{sid}?expand=contains")
+    assert r.status_code == 200
+    body = r.json()
+    assert body["subsystem"]["id"] == sid
+    assert {c["name"] for c in body["contains"]} == {"Primary Mirror", "Diverger Lens"}
+
+
+def test_subsystem_contents_includes_child_subsystems_and_excludes_inactive(tmp_data_dir):
+    """Codex V1-A P3: lock in two intended behaviors that aren't
+    obvious from the data shape:
+      1. Child *Subsystems* (nested) surface in `contains` — the impl
+         walks part_of irrespective of child entity_type.
+      2. Children whose status is not 'active' are filtered out."""
+    init_db()
+    init_engineering_schema()
+
+    parent = create_entity("subsystem", "Parent System", project="p-nested")
+    child_ss = create_entity("subsystem", "Child Subsystem", project="p-nested")
+    child_comp = create_entity("component", "Child Component", project="p-nested")
+    invalid_comp = create_entity("component", "Invalidated Component", project="p-nested")
+    create_relationship(child_ss.id, parent.id, "part_of")
+    create_relationship(child_comp.id, parent.id, "part_of")
+    create_relationship(invalid_comp.id, parent.id, "part_of")
+
+    invalidate_active_entity(invalid_comp.id, reason="v1a regression seed")
+
+    result = subsystem_contents(parent.id)
+    names_by_type = {(c["entity_type"], c["name"]) for c in result["contains"]}
+    assert ("subsystem", "Child Subsystem") in names_by_type
+    assert ("component", "Child Component") in names_by_type
+    # Inactive child must not appear
+    assert all(c["name"] != "Invalidated Component" for c in result["contains"])
+    assert all(c["status"] == "active" for c in result["contains"])
+
+
+# ---------------------------------------------------------------------------
+# V1-A acceptance — the four pillar queries against the single seed graph
+# ---------------------------------------------------------------------------
+
+
+def test_v1a_pillar_queries_run_end_to_end_against_single_seed(v1a_seed):
+    """The V1-A acceptance test. All four pillar queries must report
+    the expected shape against the same seed graph. If this test fails,
+    V1-A is not done — full stop. (Per the plan: "If the four pillar
+    queries don't work, stopping here is cheap.")"""
+    project = "p05-interferometer"
+
+    # Q-001 subsystem-scoped
+    q1 = subsystem_contents(v1a_seed["subsystem"].id)
+    assert q1 is not None
+    assert {c["name"] for c in q1["contains"]} == {"Primary Mirror", "Diverger Lens"}
+
+    # Q-005 — requirements satisfied by Primary Mirror
+    q5 = requirements_for(v1a_seed["primary"].id)
+    assert q5["count"] == 1
+    assert q5["requirements"][0]["name"] == "Surface figure < 25 nm RMS"
+
+    # Q-006 (killer correctness) — orphan requirements in the project
+    q6 = orphan_requirements(project)
+    orphan_names = {r["name"] for r in q6["gaps"]}
+    assert "Calibration repeatable to lambda/20" in orphan_names
+    assert "Surface figure < 25 nm RMS" not in orphan_names
+
+    # Q-017 — evidence chain for the supported ValidationClaim
+    q17 = evidence_chain(v1a_seed["claim_supported"].id)
+    via_supports = [edge for edge in q17["evidence_chain"] if edge["via"] == "supports"]
+    assert any(edge["source_name"] == "FEA thermal sweep 2026-04" for edge in via_supports)
+
+    # And the unsupported claim must have an empty supports chain
+    q17_unsup = evidence_chain(v1a_seed["claim_unsupported"].id)
+    assert not any(edge["via"] == "supports" for edge in q17_unsup["evidence_chain"])
+
+
+def test_v1a_seed_also_exercises_q009_and_q011_killers(v1a_seed):
+    """Per Codex V1-A P2: the seed already includes Q-009 (decision on
+    flagged assumption) and Q-011 (unsupported validation claim) data,
+    so the V1-A integration test should assert those killer queries
+    surface them. Otherwise the seed entities are dead weight."""
+    project = "p05-interferometer"
+
+    q9 = risky_decisions(project)
+    risky_names = {row["decision_name"] for row in q9["gaps"]}
+    assert "Pre-order CGH from external vendor" in risky_names
+
+    q11 = unsupported_claims(project)
+    unsupported_names = {row["name"] for row in q11["gaps"]}
+    assert "Vibration isolation passes spec" in unsupported_names
+    assert "Thermal margin is adequate" not in unsupported_names