machine-docs: move all per-phase coordination files out of repo root

STATUS/BACKLOG/REVIEW/JOURNAL for bsky/conc/dstamp/kuma/lvl5/mailu/rcust/shot
(32 files) were at the repo root; move them into machine-docs/ to match the
mandated file-location rule (DECISIONS/DEFERRED/INBOX + older phases already
live there). AGENTS.md gains an explicit File-location rule. No content change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

machine-docs/STATUS-conc.md

@@ -0,0 +1,62 @@
+# STATUS — sub-phase conc (concurrency restructure)
+
+Plan: /srv/cc-ci/cc-ci-plan/concurrency-restructure-full-plan.md (SSOT for this phase)
+
+## DONE
+
+Both gates Adversary-verified fresh in REVIEW-conc.md, no open VETO:
+- M1 — implementation verified: PASS @2026-06-10T04:38Z (branch @d3fe9e2)
+- M2 — merged + live-verified (a)–(d): PASS @2026-06-10T08:55Z (final main 139e319/74ed240)
+- CONC-A1 (M2(c) live finding): fixed b6e12ef, veto LIFTED + closed @09:05Z
+
+## Phase state
+
+- Phase: conc — concurrency restructure (P1–P5 + tests/concurrency) — COMPLETE
+- Merged to main: bb5eb3d (restructure) + b7a009c (wrapper exit-code fix) + 139e319 (CONC-A1 fix)
+- Correction per M2 verdict: 139e319's first parent is 2173894 (not 4ad55ed as the claim said);
+  immaterial — the code-diff-empty check (139e319 vs b6e12ef) is authoritative.
+
+## Gate claim: M2 — merged + live-verified
+
+**WHAT**: branch merged to main after M1 PASS; live verification (a)–(d) all green on the final
+main code (which includes two M2-found fixes, both already Adversary-verified: wrapper exit-code
+e1c4198/b7a009c, CONC-A1 run-keyed state files b6e12ef/139e319).
+
+**WHERE**: main tip code = merge 139e319 (parents 4ad55ed ∘ b6e12ef); branch tip b6e12ef.
+All evidence builds ran post-139e319. Drone repo recipe-maintainers/cc-ci; host cc-ci.
+
+**HOW + EXPECTED (cold re-check from your own access path):**
+
+1. Merge integrity: `git diff 139e319 b6e12ef -- runner/ tests/ docs/ .drone.yml nix/` → EMPTY;
+   no force-push anywhere (reflog linear).
+2. Push build green on main: Drone builds 283 (branch fix), 284 (merge 139e319), 285 (inbox
+   commit) → all `status=success` (push events). No main push since has a red build.
+3. Suites at b6e12ef (cold clone): `cc-ci-run -m pytest tests/unit -q` → 138 passed;
+   `cc-ci-run -m pytest tests/concurrency -q` → 23 passed; `nix develop .#lint --command bash
+   scripts/lint.sh` → lint: PASS. (You already cold-verified these + mutation-proofed
+   test_run_state per REVIEW-conc 08:4xZ entry.)
+4. **(a) cancel-mid-run, on fixed harness**: build **295** (custom immich PR=2, comment 14307
+   @08:50:02Z). Canceled via `DELETE /api/repos/recipe-maintainers/cc-ci/builds/295` @08:51:05Z
+   (HTTP 200) while mid-deploy (lock held by harness pid 763099, 4 immich services converging).
+   EXPECTED/observed: build `status=killed`; pid 763099 gone by 08:51:15Z (SIGTERM funnel ran
+   the run's own teardown); `pgrep -f run_recipe_c[i]` → none; `lslocks | grep cc-ci-app` →
+   none (lock released); immi services/volumes/secrets/server-envs all 0. Zero leakage, no
+   janitor needed (better than plan minimum).
+5. **(b) parallel runs**: builds **287** (immich#2) + **288** (plausible#3), both started
+   08:17:40Z (parallel), both `status=success`, both logs `deploy-count = 1 (expect 1)` +
+   level=4. Host after: zero harness procs / services / volumes / secrets / envs.
+6. **(c) double-!testme same PR**: builds **290** + **291** (both immich#2, domain immi-ad3e33).
+   291 log line 1: `== app lock: another run of immi-ad3e33... is in flight — waiting ==`,
+   `acquired` @+1411s = exactly 290's exit (08:46:05Z). BOTH `status=success`, both
+   `deploy-count = 1`, level=4. Zero leakage after. (Your M2(c) PASS @09:05Z already covers
+   this; kernel-lock-table observation yours.)
+7. **(d) full green run**: build **287** = complete immich e2e on final harness, all 5 tiers
+   pass, level=4 (288 plausible likewise).
+
+**Notes for verification**: builds 290/291 ran ~20 min each due to an immich-ML healthcheck
+flake (your 08:43Z note) — converged within DEPLOY_TIMEOUT=1500s; unrelated to the restructure.
+Unheld 0-byte lockfiles left behind by design (tidy-swept at next janitor probe).
+
+## Blockers
+
+(none)