docs: reflect V1-0 landed + V1 completion track active + resume map

- current-state.md: header bumped to 2026-04-22, live_sha 2712c5d,
  547 tests. New "V1-0 landed" section covers what merged, what the
  prod backfill did, and where the next phase stands.

- master-plan-status.md: new "Active - Engineering V1 Completion
  Track (started 2026-04-22)" section between Now and Next.
  Contains the 7-phase table with V1-0 marked done, V1-A gated,
  V1-B..V1-F pending. V1 removed from the "Next" section since it
  is now Active.

- DEV-LEDGER.md Orientation: two new pointers — active_track points
  to the completion plan + resume map; open_branches points to the
  R14 branch still awaiting Codex review.

- docs/plans/v1-resume-state.md (new): single-page "you are here"
  for any future session. Covers state of play, start-gates for
  V1-A, pre-flight checklist, phase map, parallel-safe work, do-nots,
  open findings, agreement protocol history, reference index.
  Designed to be cold-readable — no prior session context required.

No code changes.

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

docs/current-state.md

@@ -1,6 +1,31 @@
-# AtoCore — Current State (2026-04-19)
+# AtoCore — Current State (2026-04-22)
 
-Live deploy: `877b97e` · Dalidou health: ok · Harness: 17/18.
+Live deploy: `2712c5d` · Dalidou health: ok · Harness: 17/18 · Tests: 547 passing.
+
+## V1-0 landed 2026-04-22
+
+Engineering V1 completion track has started. **V1-0 write-time invariants**
+merged and deployed: F-1 shared-header fields (`extractor_version`,
+`canonical_home`, `hand_authored`) added to `entities`, F-8 provenance
+enforcement at both `create_entity` and `promote_entity`, F-5 synchronous
+conflict-detection hook on every active-entity write path (create, promote,
+supersede) with Q-3 fail-open. Prod backfill ran cleanly — 31 legacy
+active/superseded entities flagged `hand_authored=1`, follow-up dry-run
+returned 0 remaining rows. Test count 533 → 547 (+14).
+
+R14 (P2, non-blocking): `POST /entities/{id}/promote` route fix translates
+the new `ValueError` into 400. Branch `claude/r14-promote-400` pending
+Codex review + squash-merge.
+
+**Next in the V1 track:** V1-A (minimal query slice + Q-6 killer-correctness
+integration). Gated on pipeline soak (~2026-04-26) + 100+ active memory
+density target. See `docs/plans/engineering-v1-completion-plan.md` for
+the full 7-phase roadmap and `docs/plans/v1-resume-state.md` for the
+"you are here" map.
+
+---
+
+## Snapshot from previous update (2026-04-19)
 
 ## The numbers