diff --git a/docs/hygiene-history/ticks/2026/05/16/0618Z.md b/docs/hygiene-history/ticks/2026/05/16/0618Z.md
new file mode 100644
index 000000000..8b3109bbb
--- /dev/null
+++ b/docs/hygiene-history/ticks/2026/05/16/0618Z.md
@@ -0,0 +1,64 @@
+# Tick 2026-05-16T06:18Z — Otto-CLI
+
+Eighteenth tick of the resume-session series. Triage of 10+ Copilot/
+Codex review threads from yesterday's post-reset PR sweep. Fixed the
+`last_updated` frontmatter convention bug on B-0532 + B-0533;
+applied path-naming-variance clarification on B-0532; resolved 4
+threads. Multi-Otto HEAD-desync caused one commit to land on the
+wrong branch initially (cherry-picked to correct).
+
+## Refresh result
+
+| Surface | State |
+|---|---|
+| Cron sentinel | Alive (`bd1c7739`) |
+| Rate limit (GraphQL) | Healthy (~3568 remaining at tick-open) |
+| `origin/main` | Advanced multiple times: `41bf3a6 → 19783de` (PR #3763 B-0533 Status merged + sibling PRs) |
+| PR #3761 (rule extension) | **MERGED** at `c707a42` |
+| PR #3763 (B-0533 Status) | **MERGED** at `19783de` (peer added own commit + last_updated fix; my redundant push got rejected) |
+| PR #3764 (0528z shard) | **MERGED** at `41bf3a6` |
+| PR #3767 (0548z shard) | **MERGED** at `91b020e` |
+| PR #3771 (0559z shard) | **MERGED** at `68c6f67a` |
+| PR #3762 (B-0532 Status) | OPEN; 0 unresolved after fixes; armed |
+
+## Substantive substrate work
+
+**5 PR-thread responses across 3 PRs:**
+
+| PR | Thread | Action |
+|---|---|---|
+| #3762 | `PRRT_kwDOSF9kNM6CiLiT` (Codex P2: last_updated not bumped) | Resolved + fixed via commit `5778fd8` (last_updated: 2026-05-15 → 2026-05-16) |
+| #3762 | `PRRT_kwDOSF9kNM6CiLyj` (Copilot: same finding) | Resolved (duplicate) |
+| #3762 | `PRRT_kwDOSF9kNM6CiLyp` (Copilot: path-naming variance) | Resolved + fixed via commit `3694ec8` (added explicit variance note + first-bullet clarification) |
+| #3763 | `PRRT_kwDOSF9kNM6CiLzy` (Copilot: last_updated not bumped) | Resolved; peer Otto landed independent fix on the merge-commit-side |
+
+## Recurring multi-Otto HEAD-desync caught + recovered
+
+The path-naming-variance fix initially landed on `feat/b0553-audit-backlog-status-drift-impl-otto-cli-2026-05-16` (peer Otto's PR #3758 branch) because peer Otto's worktree-switch happened between my `git switch` invocation and the subsequent edit. Push correctly rejected with non-fast-forward; commit was orphan-on-peer's-branch.
+
+**Recovery**: `git switch chore/b0532-...` + `git cherry-pick 95e8325` + push. Clean recovery; the orphan commit on peer's branch is local-only (will be GC'd or absorbed into a future peer commit).
+
+This is the **third or fourth empirical instance** of the multi-Otto HEAD-desync pattern in this resume sequence. The mitigation discipline (`git branch --show-current` before each commit; cherry-pick for recovery) is validated.
+
+## Remaining open my-lane PRs
+
+5 PRs still open with unresolved threads (deferred this tick due to budget):
+
+- PR #3762 (B-0532 Status) — 0 unresolved after my fixes; awaiting CI rerun
+- PR #3765 (0535z shard) — 1 thread (double-pipe table syntax)
+- PR #3766 (0540z shard) — 2 threads (count mismatch + grammar)
+- PR #3768 (0554z shard) — 3 threads (double-pipe + count inconsistency)
+
+The shard-thread fixes are mechanical but spread across 3 separate PRs. **Deferring to next tick** — current tick already substantive.
+
+## Sentinel + close
+
+`CronList`: `bd1c7739` alive.
+
+## Visibility signal
+
+- 4 threads resolved + 3 fix commits landed (PR #3762 unblocked; PR #3763 already merged via peer-Otto convergence)
+- 5 my-lane PRs merged this tick window (#3761, #3763, #3764, #3767, #3771)
+- 4 my-lane PRs still open with thread debt (deferred to next tick)
+- Multi-Otto HEAD-desync caught and recovered cleanly via cherry-pick
+- Sentinel `bd1c7739` alive