fix(backlog): close B-0442 + B-0503 row status (work landed via PR #3458)

docs/BACKLOG.md

@@ -258,7 +258,7 @@ are closed (status: closed in frontmatter)._
 - [x] **[B-0437](backlog/P1/B-0437-demo-ux-of-math-panel-bivector-fingerprints-2026-05-13.md)** Demo — UX-of-math panel (bivector fingerprints, partial-credit scoring)
 - [ ] **[B-0440](backlog/P1/B-0440-standing-by-failure-mode-detector-background-service-2026-05-13.md)** Standing-by failure-mode detector — background service that catches idle-foreground + nudges via bus
 - [ ] **[B-0441](backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md)** Backlog-row-ready-to-grind notifier — background service that proactively assigns claims when agent queue empty
-- [ ] **[B-0442](backlog/P1/B-0442-missed-substrate-cascade-detector-background-service-2026-05-13.md)** Missed-substrate cascade detector — background service that catches branch-vs-merged-PR drift (e.g., Otto-section-missed-PR-2980-by-3-min class)
+- [x] **[B-0442](backlog/P1/B-0442-missed-substrate-cascade-detector-background-service-2026-05-13.md)** Missed-substrate cascade detector — background service that catches branch-vs-merged-PR drift (e.g., Otto-section-missed-PR-2980-by-3-min class)
 - [x] **[B-0445](backlog/P1/B-0445-csharp-fluent-operator-surface-pm2-2026-05-13.md)** C# fluent operator surface — Map, Filter, Join, Distinct, Window via idiomatic CSharp API
 - [ ] **[B-0448](backlog/P1/B-0448-cloud-routines-integration-4th-catch-43-defence-layer-2026-05-13.md)** Cloud Routines integration — 4th catch-43 defence layer via Anthropic-hosted scheduled tasks + API + GitHub event triggers
 - [ ] **[B-0449](backlog/P1/B-0449-bg-services-slice-5-subscriber-agent-design-pass-2026-05-13.md)** bg-services slice 5 — subscriber-agent architecture design pass (closes the foreground-optional architectural claim)
@@ -305,9 +305,9 @@ are closed (status: closed in frontmatter)._
 - [ ] **[B-0500](backlog/P1/B-0500-b0441-slice-3-queue-state-guard-poll-once-wiring-2026-05-14.md)** B-0441 slice 3 — wire isAgentQueueEmpty guard into pollOnce
 - [ ] **[B-0501](backlog/P1/B-0501-b0441-slice-5-assignment-history-dedup-cooldown-2026-05-14.md)** B-0441 slice 5 — assignment history dedup cooldown (avoid re-assigning same row within short window)
 - [ ] **[B-0502](backlog/P1/B-0502-b0441-slice-6-launchd-plist-autonomous-loop-docs-2026-05-14.md)** B-0441 slice 6 — launchd plist for backlog-ready-notifier + AUTONOMOUS-LOOP.md update
-- [ ] **[B-0503](backlog/P1/B-0503-b0442-slice5a-open-recovery-pr-core-function-2026-05-14.md)** B-0442 slice 5a — openRecoveryPR core function + RecoveryAdapters + DST tests
-- [ ] **[B-0504](backlog/P1/B-0504-b0442-slice5b-wire-auto-recover-into-pollonce-2026-05-14.md)** B-0442 slice 5b — wire --auto-recover into pollOnce + real RecoveryAdapters + config flags
-- [ ] **[B-0505](backlog/P1/B-0505-b0442-slice5c-docs-autonomous-loop-acceptance-close-2026-05-14.md)** B-0442 slice 5c — docs update (AUTONOMOUS-LOOP.md + bg/README.md) + B-0442 acceptance close
+- [x] **[B-0503](backlog/P1/B-0503-b0442-slice5a-open-recovery-pr-core-function-2026-05-14.md)** B-0442 slice 5a — openRecoveryPR core function + RecoveryAdapters + DST tests
+- [x] **[B-0504](backlog/P1/B-0504-b0442-slice5b-wire-auto-recover-into-pollonce-2026-05-14.md)** B-0442 slice 5b — wire --auto-recover into pollOnce + real RecoveryAdapters + config flags
+- [x] **[B-0505](backlog/P1/B-0505-b0442-slice5c-docs-autonomous-loop-acceptance-close-2026-05-14.md)** B-0442 slice 5c — docs update (AUTONOMOUS-LOOP.md + bg/README.md) + B-0442 acceptance close
 - [ ] **[B-0507](backlog/P1/B-0507-b0448-slice1-cloud-routines-api-research-2026-05-14.md)** B-0448 slice 1 — Research Cloud Routines auth + registration API surface (resolve unknowns)
 - [ ] **[B-0508](backlog/P1/B-0508-b0448-slice2-cloud-schedule-json-schema-2026-05-14.md)** B-0448 slice 2 — Define cloud-schedule.json schema for tools/routines/<id>/
 - [ ] **[B-0509](backlog/P1/B-0509-b0448-slice3-install-ts-cloud-schedule-extension-2026-05-14.md)** B-0448 slice 3 — Extend tools/routines/install.ts to detect + surface cloud-schedule.json

docs/backlog/P1/B-0442-missed-substrate-cascade-detector-background-service-2026-05-13.md

@@ -1,12 +1,14 @@
 ---
 id: B-0442
 priority: P1
-status: open
+status: closed
 title: "Missed-substrate cascade detector — background service that catches branch-vs-merged-PR drift (e.g., Otto-section-missed-PR-2980-by-3-min class)"
 tier: factory-infrastructure
 effort: M
 created: 2026-05-13
-last_updated: 2026-05-14
+last_updated: 2026-05-15
+closed: 2026-05-15
+closed_by_pr: 3458
 depends_on: [B-0400]
 composes_with: [B-0402, B-0440, B-0441]
 children: [B-0503, B-0504, B-0505]

docs/backlog/P1/B-0503-b0442-slice5a-open-recovery-pr-core-function-2026-05-14.md

@@ -1,12 +1,13 @@
 ---
 id: B-0503
 priority: P1
-status: open
+status: closed
 title: "B-0442 slice 5a — openRecoveryPR core function + RecoveryAdapters + DST tests"
 tier: factory-infrastructure
 effort: S
 created: 2026-05-14
-last_updated: 2026-05-14
+last_updated: 2026-05-15
+closed: 2026-05-15
 parent: B-0442
 depends_on: []
 composes_with: [B-0442, B-0504]
@@ -37,7 +38,7 @@ for opening a recovery PR, independently testable before any wiring into
 
 ## Acceptance criteria
 
-- [ ] New file `tools/bg/missed-substrate-recovery.ts` exports:
+- [x] New file `tools/bg/missed-substrate-recovery.ts` exports: (landed on origin/main; design sketch below has been reconciled with as-shipped — `buildRecoveryBranchName` simplified to `(prNumber)` per PR #3458 docs)
   - `RecoveryAdapters` — interface with five adapters injected by callers:
     - `checkRecoveryPRExists(branchName: string) => boolean`
       — calls `gh pr list --head <branchName> --state open` to detect existing
@@ -60,9 +61,8 @@ for opening a recovery PR, independently testable before any wiring into
     | { status: "cherry-pick-conflict"; sha: string; attemptedCount: number }
     | { status: "error";          reason: string }
     ```
-  - `buildRecoveryBranchName(prNumber: number, ts: Date) => string`
-    — deterministic branch name `recovery/<prNumber>-<YYYYMMDDHHMMSS>`;
-      pure function; no I/O.
+  - `buildRecoveryBranchName(prNumber: number) => string`
+    — deterministic branch name `recovery/<prNumber>`; pure function; no I/O.
   - `buildRecoveryPRBody(finding: CascadeFinding) => string`
     — markdown body for the recovery PR listing `missingCommits`,
       the original `prNumber`, and a note that this was auto-generated.
@@ -79,7 +79,7 @@ for opening a recovery PR, independently testable before any wiring into
       6. `ghPrCreate(title, body, recoveryBranch)` → null → return `error`;
          non-null URL → return `opened`.
 
-- [ ] New file `tools/bg/missed-substrate-recovery.test.ts` with tests
+- [x] New file `tools/bg/missed-substrate-recovery.test.ts` with tests
   covering all `RecoveryResult` arms:
   - `"opened"` — fresh finding, no existing PR, no conflicts, push+PR succeed.
   - `"already-exists"` — `checkRecoveryPRExists` returns `true`; no mutations.
@@ -90,8 +90,8 @@ for opening a recovery PR, independently testable before any wiring into
   - `buildRecoveryBranchName` — deterministic output matches expected pattern.
   - `buildRecoveryPRBody` — contains PR number and commit SHAs.
 
-- [ ] All tests pass: `bun tools/bg/missed-substrate-recovery.test.ts`
-- [ ] `bun tools/bg/missed-substrate-detector.test.ts` still passes (no regressions)
+- [x] All tests pass: `bun tools/bg/missed-substrate-recovery.test.ts` (landed in B-0503 slice; on `origin/main`)
+- [x] `bun tools/bg/missed-substrate-detector.test.ts` still passes (no regressions) (landed in B-0503 slice; on `origin/main`)
 
 ## Design sketch
 
@@ -114,9 +114,8 @@ export type RecoveryResult =
   | { status: "cherry-pick-conflict";    sha: string; attemptedCount: number }
   | { status: "error";                   reason: string };
 
-export function buildRecoveryBranchName(prNumber: number, ts: Date): string {
-  const stamp = ts.toISOString().replace(/[-:T]/g, "").slice(0, 14);
-  return `recovery/${prNumber}-${stamp}`;
+export function buildRecoveryBranchName(prNumber: number): string {
+  return `recovery/${prNumber}`;
 }
 
 export function buildRecoveryPRBody(finding: CascadeFinding): string {
@@ -140,7 +139,7 @@ export function openRecoveryPR(
   dryRun: boolean,
   adapters: RecoveryAdapters,
 ): RecoveryResult {
-  const recoveryBranch = buildRecoveryBranchName(finding.prNumber, new Date());
+  const recoveryBranch = buildRecoveryBranchName(finding.prNumber);
 
   const exists = adapters.checkRecoveryPRExists(recoveryBranch);
   if (exists) {
@@ -192,15 +191,15 @@ adapter implementations. The real adapters (in B-0504) must validate SHA
 inputs from `CascadeFinding.missingCommits` with the same allow-list regex
 already used in `compareBranchToMerged`.
 
-## Why `openRecoveryPR` uses `new Date()` internally for the branch name
+## Why the recovery branch name is `recovery/<prNumber>` (no timestamp)
 
-The recovery branch name includes a timestamp to ensure uniqueness across
-multiple recovery attempts for the same PR number. Using `new Date()` inside
-`openRecoveryPR` rather than injecting it via adapters is intentional: the
-idempotency gate (`checkRecoveryPRExists`) already prevents duplicate
-recovery PRs; the timestamp is not load-bearing for correctness. For tests
-that need to verify the branch name, `buildRecoveryBranchName` is exported
-and tested separately.
+The original sketch included a `<YYYYMMDDHHMMSS>` suffix to guarantee
+uniqueness across multiple recovery attempts. The shipped implementation
+dropped it: the idempotency gate (`checkRecoveryPRExists`) already prevents
+duplicate recovery PRs for the same source PR, so a single deterministic
+name per `prNumber` is correct AND simpler to test. Documented in PR #3458's
+`docs/AUTONOMOUS-LOOP.md` update — "deterministic branch name
+`recovery/<prNumber>`".
 
 ## Dependency chain
 

docs/backlog/P1/B-0504-b0442-slice5b-wire-auto-recover-into-pollonce-2026-05-14.md

@@ -1,12 +1,14 @@
 ---
 id: B-0504
 priority: P1
-status: open
+status: closed
 title: "B-0442 slice 5b — wire --auto-recover into pollOnce + real RecoveryAdapters + config flags"
 tier: factory-infrastructure
 effort: S
 created: 2026-05-14
-last_updated: 2026-05-14
+last_updated: 2026-05-15
+closed: 2026-05-15
+closed_by_pr: 3458
 parent: B-0442
 depends_on: [B-0503]
 composes_with: [B-0442, B-0503, B-0505]

docs/backlog/P1/B-0505-b0442-slice5c-docs-autonomous-loop-acceptance-close-2026-05-14.md

@@ -1,12 +1,14 @@
 ---
 id: B-0505
 priority: P1
-status: open
+status: closed
 title: "B-0442 slice 5c — docs update (AUTONOMOUS-LOOP.md + bg/README.md) + B-0442 acceptance close"
 tier: factory-infrastructure
 effort: XS
 created: 2026-05-14
-last_updated: 2026-05-14
+last_updated: 2026-05-15
+closed: 2026-05-15
+closed_by_pr: 3458
 parent: B-0442
 depends_on: [B-0504]
 composes_with: [B-0442, B-0503, B-0504]