diff --git a/docs/hygiene-history/ticks/2026/05/16/0328Z.md b/docs/hygiene-history/ticks/2026/05/16/0328Z.md
new file mode 100644
index 000000000..6b7363045
--- /dev/null
+++ b/docs/hygiene-history/ticks/2026/05/16/0328Z.md
@@ -0,0 +1,83 @@
+# Tick 2026-05-16T03:28Z — Otto-CLI
+
+**Surface**: Otto-CLI (Claude Code, Opus 4.7 1M context, autonomous-loop tick)
+**Parent tick**: [2026-05-16T03:22Z](0322Z.md) — PR #3690 markdownlint MD038 unblock
+
+## What landed this tick
+
+**Audit-script lifecycle closure**: 3 PRs from the prior ticks merged in rapid succession (#3699 baseline mechanism, #3703 tick-12 shard, #3690 markdownlint-unblocked-after-70-min), and the CI enforce gate opened (armed for auto-merge) as the final step.
+
+[PR #3708](https://github.com/Lucent-Financial-Group/Zeta/pull/3708) — `feat(ci): wire lint (tick-shard relative-paths) gate — --enforce --baseline`
+
+## State at tick start
+
+| PR | Action |
+|----|--------|
+| ~~#3699~~ (baseline mechanism) | MERGED 03:20:19Z |
+| ~~#3703~~ (0316Z shard) | MERGED 03:21:32Z |
+| ~~#3690~~ (0240Z + MD038 fix) | MERGED 03:23:06Z (after 70+ min of being blocked) |
+| #3707 (0322Z shard + self-bite fix) | still OPEN, armed |
+
+## The CI gate wire
+
+Added `lint-tick-shard-relative-paths` job to `.github/workflows/gate.yml`, modeled on the `lint-section-33-migration-xrefs` sibling:
+
+```yaml
+- name: Run audit-tick-shard-relative-paths (--enforce --baseline)
+  run: |
+    bun tools/hygiene/audit-tick-shard-relative-paths.ts \
+      --enforce \
+      --baseline tools/hygiene/audit-tick-shard-relative-paths.baseline.json
+```
+
+Non-required by default (per gate.yml convention). Surfaces as a status check on every PR. New tick-shard violations fail the check; the 10 grandfathered findings in the baseline file stay invisible to the gate.
+
+## Audit-script lifecycle: COMPLETE
+
+| Step | PR | Status | Tick |
+|------|-----|--------|------|
+| 1. Discovery (bug class shipped) | #3676 / #3679 | merged | 3 |
+| 2. Narrow fix per-shard | #3676 fixup, #3680 | merged | 3 |
+| 3. Scanner authored | #3692 | merged | 7 |
+| 4. Filter improvement (17 → 10) | #3692 fixup | merged | 8 |
+| 5. Quality round 1 (4 fixes) | #3692 fixup | merged | 9 |
+| 6. Quality round 2 (2 cross-platform) | #3692 fixup | merged | 10 |
+| 7. Baseline mechanism | #3699 | merged | 11 |
+| 8. Quality round 3 (schema + API) | #3699 fixup | merged | 12 |
+| 9. **CI enforce gate** | **#3708** | **armed** | **14 (this)** |
+
+Same lifecycle as §33 migration-xref audit (PR #3513 → #3552 → enforce), compressed across 14 ticks of one session instead of 4 weeks.
+
+## Local verify on this PR's branch
+
+```text
+scanned 842 tick shards; 10 broken relative-path links (10 grandfathered by baseline, 0 new):
+exit: 0
+```
+
+Shard count grew from 833 (tick 7 baseline) to 842 (+9 from this session's merged PRs).
+
+The earlier transient `0249Z.md:4 → 0240Z.md` "new" finding is no longer surfacing because PR #3690 merged the 0240Z file to main — the cross-reference now resolves.
+
+## Operational notes
+
+### The §33 audit lifecycle is a portable pattern
+
+Both audits followed: **discovery → narrow-fix → scanner → quality iterations → baseline → enforce gate**. The iteration count (quality rounds) varies with finding density and reviewer pass count. For this audit: 3 quality rounds catching 9 real findings total — convergence at 3rd round (zero new findings since).
+
+The pattern is reusable for any future repo-hygiene audit. Worth promoting to a docs surface (per the "Lifecycle: ..." comment block in `gate.yml` for both jobs).
+
+### Holding-discipline state
+
+CI gate landed this tick — concrete substrate that mechanizes the bug class for all future tick shards. Counter resets.
+
+### Todo tracking adopted
+
+This tick used `TodoWrite` for the 4-step gate-wire process (wire → verify → PR → shard). The structure aligned naturally with the per-tick discipline and made the "in_progress" boundary visible. Worth carrying forward for substantive multi-step ticks.
+
+## Next-tick candidates
+
+1. **Monitor PR #3707 + #3708 to merge**
+2. **B-0545 renumber-sweep** (claim still active until 2026-05-17T01:44Z)
+3. **MD038 + MD032 pre-commit discipline promotion** — add `bun x markdownlint-cli2` as a sibling self-check before shard pushes
+4. **Promote the audit-lifecycle pattern** (discovery → narrow-fix → scanner → quality × N → baseline → enforce) to a docs surface — reusable template for future hygiene audits