shard(tick): 1844Z — B-0533 Slice A baseline cleanup complete (10 → 0)

docs/hygiene-history/ticks/2026/05/15/1844Z.md

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+# Tick 1844Z — B-0533 Slice A baseline cleanup complete (10 dead xrefs → 0)
+
+## Headline
+
+- [PR #3550](https://github.com/Lucent-Financial-Group/Zeta/pull/3550) (1833Z shard) MERGED.
+- [PR #3552](https://github.com/Lucent-Financial-Group/Zeta/pull/3552) — **B-0533 Slice A baseline cleanup**: 6 files, 10 line-edits. Verified via `bun tools/hygiene/audit-section-33-migration-xrefs.ts` → **0 dead xrefs remaining**. Auto-merge armed (MERGEABLE).
+- Cron sentinel `575d1226` live.
+
+## Discipline arc closing
+
+Today's 8-tick session has carried B-0533 from finding-class to operational-zero:
+
+| Tick | Slice | Substance |
+|---|---|---|
+| 1749Z | Codex P2 catch | [PR #3529](https://github.com/Lucent-Financial-Group/Zeta/pull/3529) — narrow 3-file backlink fix (Riven) |
+| 1807Z | Pattern capture | [PR #3540](https://github.com/Lucent-Financial-Group/Zeta/pull/3540) — B-0533 backlog row + two-slice plan |
+| 1820Z | Slice A POC | [PR #3544](https://github.com/Lucent-Financial-Group/Zeta/pull/3544) — 1-file POC + inline annotation convention |
+| 1833Z | Slice B.1 scanner | [PR #3548](https://github.com/Lucent-Financial-Group/Zeta/pull/3548) — `audit-section-33-migration-xrefs.ts` mechanization |
+| **1844Z** | **Slice A baseline cleanup** | **[PR #3552](https://github.com/Lucent-Financial-Group/Zeta/pull/3552) — 6 files, 10 line-edits, scanner reports 0** |
+
+Remaining future work (separate ticks):
+
+- **Slice B.2**: test file (DST-friendly fixtures)
+- **Slice B.3**: wire scanner into `gate.yml` as warn-only
+- **Slice B.4**: promote scanner to error (now safe with 0-baseline)
+
+## The pattern in shape
+
+The narrow Codex P2 finding (PR #3513 dead-xref) generalised into:
+
+```
+Catch instance → file class-level row → ship POC → ship scanner →
+clean baseline → wire into CI (warn) → promote to error (deny)
+```
+
+That's the catch-once-then-lint pattern (per
+[`.claude/rules/encoding-rules-without-mechanizing.md`](../../../../../../.claude/rules/encoding-rules-without-mechanizing.md))
+operating at substrate-architecture scope. Each step is a small atomic
+PR; the sum is a durable factory-immune-system surface against the
+§33-migration dead-xref class.
+
+## Substrate-honest meta-note
+
+The 1807Z scan estimated "20+" dead xrefs. The 1833Z scanner found 10.
+The 1844Z cleanup reduced to 0. Each tick's measurement was MORE
+substrate-honest than the prior — the scanner IS the substrate-honest
+measurement infrastructure, and the rough-scan estimate was the failure
+mode it was built to replace.
+
+## Per-tick discipline trace
+
+1. **Refresh**: PR #3550 confirmed MERGED.
+2. **Holding-discipline**: no named-dep wait → speculative work.
+3. **Pick work**: B-0533 Slice A baseline cleanup using scanner output as the spec.
+4. **Verify**: scanner re-run after edits → 0 dead xrefs.
+5. **Shard**: this file.
+6. **CronList**: sentinel live.
+7. **Visibility**: PR #3552 + this shard.
+
+## 8-tick parallel-substantive pattern
+
+8 consecutive ticks, 8 substantive PRs landed (or in-flight). Each tick:
+
+- Refresh
+- Find or continue work
+- Ship atomic PR
+- Shard
+- CronList check
+- Stop
+
+The discipline scales linearly across ticks. Cron sentinel is the
+heartbeat; parallel-work-while-CI is the metabolism.
+
+## Composes with
+
+- [`.claude/rules/encoding-rules-without-mechanizing.md`](../../../../../../.claude/rules/encoding-rules-without-mechanizing.md) — the catch-once-then-lint pattern at substrate scope
+- [`.claude/rules/holding-without-named-dependency-is-standing-by-failure.md`](../../../../../../.claude/rules/holding-without-named-dependency-is-standing-by-failure.md) — parallel-work compounds
+- [`.claude/rules/substrate-or-it-didnt-happen.md`](../../../../../../.claude/rules/substrate-or-it-didnt-happen.md) — measurement (scanner) becomes durable substrate
+- [B-0533](../../../../../backlog/P3/B-0533-section33-migration-dead-xref-sweep-and-lint-2026-05-15.md) parent row + all its slices