shard(tick): 2123Z — audit-driven: file B-0461 to close broken composes_with edge

docs/hygiene-history/ticks/2026/05/14/2123Z.md

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+# Tick 2026-05-14T21:23Z — audit-driven: file B-0461 to close broken composes_with edge
+
+## Refresh (step 1)
+
+- Cron sentinel `12fb713e` live.
+- Prior-tick PRs merged this batch:
+  - **#3249** (shard 2108Z + MD032 fix) → `f74e577`
+  - **#3250** (duplicate-ID audit class) → `47eb547`
+  - **#3252** (shard 2119Z) → `330392f`
+- **#3252** merged DURING this tick's planning.
+
+## Holding discipline (step 2)
+
+Not Standing-by. Per never-be-idle: the just-merged audit-backlog-items.ts
+(via #3250) now has the 8th class but ALSO reports 1 broken composes_with
+edge on origin/main. Acting on that finding.
+
+## Work (step 3) — audit-driven: file the missing B-0461
+
+`audit-backlog-items.ts` reported:
+
+```text
+## 4. Broken composes_with pointers
+
+  - B-0460 [P1] composes_with missing B-0461
+
+**Broken composes_with edges: 1**
+```
+
+Investigation: B-0461 was referenced as a placeholder in two rows
+(B-0449 design pass + B-0460 sibling table) but didn't exist as a file.
+Per the B-0449 Option C design, B-0461 is the third sibling in the
+slice-5 subscriber-handler family:
+
+| Slice | Topic | Producer | Row |
+|---|---|---|---|
+| 5.1 | `infinite-backlog-nudge` | B-0440 | B-0459 |
+| 5.2 | `work-assignment` | B-0441 | B-0460 |
+| 5.3 | `missed-substrate-cascade` | B-0442 | **B-0461 (now filed)** |
+
+Substantive landing:
+
+- Authored `docs/backlog/P1/B-0461-b0442-slice-5-3-missed-substrate-cascade-handler-2026-05-14.md`
+  following B-0459's shape (123 lines covering frontmatter, AC, scope
+  clarification, dependency chain, composes_with, and pre-start checklist)
+- Audit verification: 1 → 0 broken composes_with edges
+
+PR **#3253** opened; auto-merge armed.
+
+## Verify (step 4)
+
+- `markdownlint-cli2` clean on the new row
+- `bun tools/hygiene/audit-backlog-items.ts` → broken-composes_with edges: 0
+- Composite branch-guard + `gh pr create --head` used
+
+## Shard (step 5)
+
+This file.
+
+## CronList (step 6)
+
+Sentinel `12fb713e` armed; one entry, recurring.
+
+## Visibility (step 7)
+
+- **PR #3253** (feat(b-0461)) — wait-ci, autoMerge armed
+- **#3249 / #3250 / #3252** merged this batch
+- Three subscriber-handler rows now complete: B-0459 / B-0460 / B-0461
+
+## Session running tally (after this tick)
+
+- Merged (21): #3221 + #3222 + #3226 + #3227 + #3228 + #3231 + #3232 +
+  #3233 + #3235 + #3237 + #3239 + #3240 + #3244 + #3245 + #3246 + #3247 +
+  #3248 + #3249 + #3250 + #3251 + #3252
+- Wait-ci (2): #3253 + this shard's PR
+
+## Notes for future-Otto
+
+**Audit-driven workflow** observed this tick:
+
+1. New audit class lands (`reportDuplicateIds` — #3250 merged)
+2. Audit runs on main; surfaces 1 known-gap (broken composes_with edge)
+3. Investigate the finding → reveals legitimate missing-row (B-0461 was
+   referenced but never authored)
+4. Author the row → audit goes clean
+
+This is the right cadence for an audit tool: detection at run-time +
+inline-fix when the finding is small + atomic. Cousin to the
+**three-step propagation pattern** from tick 2113Z:
+
+- Review-time catch → out-of-band fix → mechanization (Copilot-driven)
+- Run-time audit → finding → fix (audit-driven)
+
+Both produce durable factory defenses. Both lift one-off catches into
+mechanized + closed loops.
+
+The slice-5 subscriber-handler family (B-0459 / B-0460 / B-0461) is now
+**complete as backlog rows** — the implementation work itself is still
+gated on B-0449 (subscribe-once library) landing first.