shard(tick): 1907Z — audit-rule-cross-refs surfaced 2 real stale pointers

docs/hygiene-history/ticks/2026/05/15/1907Z.md

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+# Tick 1907Z — audit-rule-cross-refs surfaced 2 real stale pointers in rules
+
+## Headline
+
+- [PR #3557](https://github.com/Lucent-Financial-Group/Zeta/pull/3557) (1855Z shard) MERGED.
+- [PR #3555](https://github.com/Lucent-Financial-Group/Zeta/pull/3555) (B-0533 Slice B.3+B.4) — still wait-CI, auto-merge armed (MERGEABLE).
+- **10th-in-a-row speculative catch**: ran `bun tools/hygiene/audit-rule-cross-refs.ts`, surfaced 48 stale-pointer candidates. 9-variant taxonomy filtered most as false positives (template-path / basename / glob / anti-pattern variants). **2 genuine bugs** caught and fixed in [PR #3558](https://github.com/Lucent-Financial-Group/Zeta/pull/3558).
+- Cron sentinel `575d1226` live.
+
+## The 2 real bugs
+
+### Fix 1 — `m-acc-multi-oracle-end-user-moral-invariants.md`
+
+`.claude/rules/naming-expert.md` → `.claude/skills/naming-expert/SKILL.md`
+
+The real artifact is a SKILL at `.claude/skills/naming-expert/`, not a rule. 9-variant taxonomy: **alternative-location**.
+
+### Fix 2 — `default-to-both.md`
+
+Two references to `memory/feedback_aaron_wwjd_keeps_the_grey_in_aaron_honest_devil_lives_in_the_grey_in_numbers_2026_05_12.md` removed. File never existed:
+
+- `ls memory/ | grep keeps_the_grey` → no matches
+- `git log --all -- "*keeps_the_grey*"` → empty
+
+9-variant taxonomy: **anti-pattern** (rule referenced aspirational content that never materialized).
+
+## Pattern: audit-tool composition
+
+The `audit-rule-cross-refs.ts` tool is the sibling of the §33 dead-xref scanner I just shipped (`audit-section-33-migration-xrefs.ts`). Different failure classes, same shape:
+
+| Scanner | Class detected | CI-wired? |
+|---|---|---|
+| `audit-section-33-migration-xrefs` | dead xrefs to migrated archive files | YES (PR #3555 — wait-CI) |
+| `audit-rule-cross-refs` | stale pointers in `.claude/rules/*.md` | NO (detect-only; humans triage 9-variant taxonomy) |
+| `check-archive-header-section33` | missing §33 header in `docs/research/**` | YES (B-0036, in gate.yml) |
+| `audit-memory-references` | (various) | varies |
+
+The 9-variant-taxonomy approach (audit-rule-cross-refs) preserves expert judgment over mechanical enforcement — appropriate because rules legitimately reference: template paths, command strings, future files, alternative locations, retired artifacts. Different than the §33 case where the migration target IS deterministic.
+
+## Per-tick discipline trace
+
+1. **Refresh**: PR #3557 confirmed MERGED.
+2. **Holding-discipline**: PR #3555 wait-CI is real named-dep → parallel speculative work.
+3. **Pick work**: ran existing audit-rule-cross-refs to look for orthogonal substrate bugs.
+4. **Verify**: 48 candidates → 2 genuine bugs after applying 9-variant taxonomy + file-existence checks + git archaeology.
+5. **Shard**: this file.
+6. **CronList**: sentinel live.
+7. **Visibility**: PR #3558 + this shard.
+
+## 10-tick parallel-substantive arc
+
+| Tick | Substantive | Notable |
+|---|---|---|
+| 1718Z–1820Z | §33 cascade (B-0533 setup) | 6 PRs |
+| 1833Z | Slice B.1 scanner | Mechanization |
+| 1844Z | Slice A baseline cleanup | 10 → 0 |
+| 1855Z | Slice B.3+B.4 (CI gate) | Gate.yml wired |
+| **1907Z** | **Stale-pointer cleanup (audit-rule-cross-refs)** | **Sibling-scanner findings** |
+
+The discipline pivots smoothly between mechanization (build scanner) and cleanup (use scanner). Both produce durable substrate.
+
+## Composes with
+
+- [`.claude/rules/encoding-rules-without-mechanizing.md`](../../../../../../.claude/rules/encoding-rules-without-mechanizing.md) — scanner output IS the actionable artifact
+- [`.claude/rules/holding-without-named-dependency-is-standing-by-failure.md`](../../../../../../.claude/rules/holding-without-named-dependency-is-standing-by-failure.md) — parallel-audit while CI runs
+- `tools/hygiene/audit-rule-cross-refs.ts` — the scanner this tick used
+- `docs/hygiene-history/ticks/2026/05/14/1920Z.md` — origin of the 9-variant taxonomy