feat(wiki): [[wikilinks]] with redlinks + cross-project resolver (Issue B)

Last P2 from Antoine's "daily-usable" sprint. Entities referenced via
[[Name]] in descriptions or mirror markdown now render as:

- live wikilink if the name matches an entity in the same project
- live cross-project link with "(in project X)" scope indicator if the
  only match is in another project
- red italic redlink pointing at /wiki/new?name=... otherwise

Clicking a redlink opens a pre-filled "create this entity" form that
POSTs to /v1/entities and redirects to the new entity's page.

- engineering/wiki.py: _wikilink_transform + _resolve_wikilink,
  applied in render_project (pre-markdown) and render_entity
  (description body). render_new_entity_form for the create page.
  CSS for .wikilink / .wikilink-cross / .redlink / .new-entity-form
- api/routes.py: GET /wiki/new?name&project
- tests/test_wikilinks.py: 12 tests including the spec regression
  (A references [[B]] -> redlink; create B -> link becomes live)
- DEV-LEDGER.md: session log + test_count 521 -> 533

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

DEV-LEDGER.md

@@ -9,7 +9,7 @@
 - **live_sha** (Dalidou `/health` build_sha): `775960c` (verified 2026-04-16 via /health, build_time 2026-04-16T17:59:30Z)
 - **last_updated**: 2026-04-18 by Claude (Phase 7A — Memory Consolidation "sleep cycle" V1 on branch, not yet deployed)
 - **main_tip**: `999788b`
-- **test_count**: 521 (prior 509 + 12 new PATCH-entity tests)
+- **test_count**: 533 (prior 521 + 12 new wikilink/redlink tests)
 - **harness**: `17/18 PASS` on live Dalidou (p04-constraints expects "Zerodur" — retrieval content gap, not regression)
 - **vectors**: 33,253
 - **active_memories**: 84 (31 project, 23 knowledge, 10 episodic, 8 adaptation, 7 preference, 5 identity)
@@ -160,6 +160,8 @@ One branch `codex/extractor-eval-loop` for Day 1-5, a second `codex/retrieval-ha
 
 ## Session Log
 
+- **2026-04-22 Claude (pm)** Issue B (wiki redlinks) landed — last remaining P2 from Antoine's sprint plan. `_wikilink_transform(text, current_project)` in `src/atocore/engineering/wiki.py` replaces `[[Name]]` / `[[Name|Display]]` tokens (pre-markdown) with HTML anchors. Resolution order: same-project exact-name match → live `wikilink`; other-project match → live link with `(in project X)` scope indicator (`wikilink-cross`); no match → `redlink` pointing at `/wiki/new?name=<quoted>&project=<current>`. New route `GET /wiki/new` renders a pre-filled "create this entity" form that POSTs to `/v1/entities` via a minimal inline fetch() and redirects to the new entity's wiki page on success. Transform applied in `render_project` (over the mirror markdown) and `render_entity` (over the description body). CSS: dashed-underline accent for live wikilinks, red italic + dashed for redlinks. 12 new tests including the regression from the spec (entity A references `[[EntityB]]` → initial render has `class="redlink"`; after EntityB is created, re-render no longer has redlink and includes `/wiki/entities/{b.id}`). Tests 521 → 533. All 6 acceptance criteria from the sprint plan ("daily-usable") now green: retract/supersede, edit without cloning, cross-project has a home, visual evidence, wiki readable, AKC can capture reliably.
+
 - **2026-04-22 Claude** PATCH `/entities/{id}` + Issue D (/v1/engineering/* aliases) landed. New `update_entity()` in `src/atocore/engineering/service.py` supports partial updates to description (replace), properties (shallow merge — `null` value deletes a key), confidence (0..1, 400 on bounds violation), source_refs (append + dedup). Writes an `updated` audit row with full before/after snapshots. Forbidden via this path: entity_type / project / name / status — those require supersede+create or the dedicated status endpoints, by design. New route `PATCH /entities/{id}` aliased under `/v1`. Issue D: all 10 `/engineering/*` query paths (decisions, systems, components/{id}/requirements, changes, gaps + sub-paths, impact, evidence) added to the `/v1` allowlist. 12 new PATCH tests (merge, null-delete, confidence bounds, source_refs dedup, 404, audit row, v1 alias). Tests 509 → 521. Next: commit + deploy, then Issue B (wiki redlinks) as the last remaining P2 per Antoine's sprint order.
 
 - **2026-04-21 Claude (night)** Issue E (retraction path for active entities + memories) landed. Two new entity endpoints and two new memory endpoints, all aliased under `/v1`: `POST /entities/{id}/invalidate` (active→invalid, 200 idempotent on already-invalid, 409 if candidate/superseded, 404 if missing), `POST /entities/{id}/supersede` (active→superseded + auto-creates `supersedes` relationship from the new entity to the old one; rejects self-supersede and unknown superseded_by with 400), `POST /memory/{id}/invalidate`, `POST /memory/{id}/supersede`. `invalidate_memory`/`supersede_memory` in service.py now take a `reason` string that lands in the audit `note`. New service helper `invalidate_active_entity(id, reason)` returns `(ok, code)` where code is one of `invalidated | already_invalid | not_active | not_found` for a clean HTTP-status mapping. 15 new tests. Tests 494 → 509. Unblocks correction workflows — no more SQL required to retract mistakes.