shard(tick): 2026-05-16T13:10Z — root-caused PR #3871 blockers (rebase + MD032)

docs/BACKLOG.md

@@ -390,7 +390,7 @@ are closed (status: closed in frontmatter)._
 - [ ] **[B-0048](backlog/P2/B-0048-3-4-color-theorem-research-track.md)** 3-color / 4-color theorem research track — graph coloring, computer-assisted proof, Gonthier Coq formalization, formal-verification routing
 - [ ] **[B-0049](backlog/P2/B-0049-mystery-schools-comparative-religion-history-of-religion.md)** Mystery schools / comparative religion / history of religion research track — CATALOG-ONLY register, gentle, no claim-staking
 - [x] **[B-0049.1](backlog/P2/B-0049.1-mystery-schools-stage1-eleusinian-bibliographic-scaffold.md)** Mystery schools Stage 1 — Eleusinian mysteries bibliographic scaffold
-- [ ] **[B-0049.2](backlog/P2/B-0049.2-mystery-schools-stage1-mithraic-bibliographic-scaffold.md)** Mystery schools Stage 1 — Mithraic mysteries bibliographic scaffold
+- [x] **[B-0049.2](backlog/P2/B-0049.2-mystery-schools-stage1-mithraic-bibliographic-scaffold.md)** Mystery schools Stage 1 — Mithraic mysteries bibliographic scaffold
 - [ ] **[B-0050](backlog/P2/B-0050-lean-reflection-capability-skill-staged-trajectory.md)** Lean reflection — learn it properly, land a capability skill + scouting note (staged 5-stage trajectory)
 - [ ] **[B-0051](backlog/P2/B-0051-isomorphism-homomorphism-catalog-consolidation.md)** Isomorphism / homomorphism catalog — consolidate the category-theory surface, identify gaps, lift to coherent track
 - [ ] **[B-0054](backlog/P2/B-0054-pop-culture-media-research-track.md)** Pop-culture / media research track — operational-resonance sweep across film, TV, YouTube documentary, music, video games, conspiracy-corpus

docs/backlog/P2/B-0049.2-mystery-schools-stage1-mithraic-bibliographic-scaffold.md

@@ -1,7 +1,7 @@
 ---
 id: B-0049.2
 priority: P2
-status: open
+status: closed
 title: Mystery schools Stage 1 — Mithraic mysteries bibliographic scaffold
 parent: B-0049
 tier: gentle-catalog-research-no-claims
@@ -68,3 +68,28 @@ Searched:
 | Stage 2 — comparative-religion framework map | B-0049.6 (to be filed) | `docs/substrate-shelves/comparative-religion-methods.md` | blocked on B-0049.1–5 |
 | Stage 3 — history-of-religion lineage diagram | B-0049.7 (to be filed) | `docs/substrate-shelves/history-of-religion-lineage.md` | blocked on B-0049.6 |
 | Stage 4 — structural-resonance notings (conditional) | B-0049.8+ (on Aaron request only) | per-noting entries | requires explicit Aaron per-noting confirm |
+
+## Resolution
+
+Closed 2026-05-16 via audit-triage discovery of substrate drift:
+
+- **Deliverable shipped**: `docs/substrate-shelves/mystery-schools-mithraic.md`
+  (435 lines, 141 domain-term mentions, proper backlog-linked frontmatter,
+  CATALOG-ONLY register preserved).
+- **Drift class**: #1 (pure drift) — file landed 2026-05-10 (frontmatter date
+  matches row's filed date), but the row's `status: open` was never updated.
+- **Surfaced by**: `tools/hygiene/audit-backlog-status-drift.ts` candidate
+  list + manual existence + content-coverage check.
+- **Composes with**: sibling B-0049.1 (Eleusinian) Stage-1 scaffold shipped
+  via PR #2408; B-0049.2 follows the same pattern.
+
+Stage 1 catalog complete for the Mithraic family. Stage 2+ work (B-0049.6
+comparative-religion framework, B-0049.7 lineage diagram, B-0049.8+
+structural-resonance notings) is downstream of all five Stage-1 families
+shipping (see Staging context table above) and remains open.
+
+Closed via second attempt — first attempt (tick 10:27Z, branch
+`otto-cli-b0049.2-audit-2026-05-16-1029z`) aborted mid-flight due to
+peer-Otto session-close branch churn during two-step Edit. Single-shot
+Bash with sed/heredoc avoids the multi-Edit-tool window that hit the
+contamination race the first time.

docs/hygiene-history/ticks/2026/05/16/1310Z.md

@@ -0,0 +1,84 @@
+# Tick 2026-05-16T13:10Z — Otto-CLI
+
+Autonomous-loop cron fire. **Stale auto-merge investigation**:
+PR #3871 has been armed since 12:15Z but not merged. Per
+[`blocked-green-ci-investigate-threads.md`](../../../../../../.claude/rules/blocked-green-ci-investigate-threads.md):
+"The block is virtually never opaque — it's almost always a
+small countable set of threads with addressable findings."
+This tick did that investigation.
+
+## Refresh result
+
+| Surface | State |
+|---|---|
+| Cron sentinel | `c9705646` armed |
+| Rate limit (GraphQL) | 4259/5000 (normal tier) |
+| Lior process | 3 |
+| HEAD at tick start | `otto-cli-audit-subclass-catalog-2026-05-16-1156z` (4th contamination — peer's branch) |
+| WT state | clean |
+| Main head | `03ffd2b` (PR #3873 / 12:36Z shard merged) |
+
+## Investigation finding — PR #3871 blockers
+
+**Two distinct failures** on `otto-cli-b0206-audit-2026-05-16-1207z`:
+
+### 1. `lint (tick-shard relative-paths)` — fixable by rebase
+
+```
+NEW findings (not in baseline):
+  docs/hygiene-history/ticks/2026/05/16/1207Z.md:100  missing
+    target: ../../../../../../memory/feedback_audit_backlog_status_drift_sub_class_catalog_otto_cli_2026_05_16.md
+```
+
+The referenced memory file landed in [PR #3870](https://github.com/Lucent-Financial-Group/Zeta/pull/3870) (commit `89e6852`, now on main). PR #3871's branch was forked off main BEFORE #3870 merged, so the file is invisible relative to the branch's tree at CI time. **Fix**: rebase #3871 onto current main.
+
+### 2. `lint (markdownlint)` MD032 — needs file edit
+
+```
+docs/hygiene-history/ticks/2026/05/16/1207Z.md:101 error MD032/blanks-around-lists
+Lists should be surrounded by blank lines
+[Context: "+ this tick's #2-SD-Nested sub..."]
+```
+
+Line 101 begins with `+ this tick's...` which markdownlint parses as a list bullet (it's actually prose continuation; `+` is meant as "plus"). **Fix**: insert blank line before line 101, OR replace `+` with the word `plus`.
+
+## Fix attempt — server-side rebase
+
+`gh pr update-branch --rebase 3871` failed twice with transient
+GitHub GraphQL errors (`E800:...` + `E8D1:...`). Both retries
+hit identical-shape errors mid-cluster. Could be GitHub server
+hiccup or rate-limit on the rebase endpoint specifically.
+
+**Alternative paths** (deferred):
+
+- Local rebase via `git switch otto-cli-b0206-audit-2026-05-16-1207z` + `git rebase origin/main` + edit + `git push --force-with-lease` — risky under Lior-active contention (3 procs)
+- New PR with corrected file content (would lose the 12:07Z shard's identity)
+- Close #3871 and accept the shards as branch-only history (loses tick-history visibility on main)
+
+Deferred to a future tick with quieter contention. Substrate
+is NOT lost — shards exist in git history on the PR branch
+even if PR never merges (per [`lost-files-surface`](../../../../../../.claude/rules/lost-files-surface.md)).
+
+## Other stalled armed PRs
+
+- [#3823](https://github.com/Lucent-Financial-Group/Zeta/pull/3823) (armed 08:14Z) — UNKNOWN state; investigate next tick
+- [#3817](https://github.com/Lucent-Financial-Group/Zeta/pull/3817) (armed 07:57Z) — UNKNOWN state; investigate next tick
+
+## Recent landings (since last tick)
+
+- [#3872](https://github.com/Lucent-Financial-Group/Zeta/pull/3872) merged ✓ (12:21Z shard — contamination obs #1)
+- [#3873](https://github.com/Lucent-Financial-Group/Zeta/pull/3873) merged ✓ (12:36Z shard — contamination obs #2)
+- [#3875](https://github.com/Lucent-Financial-Group/Zeta/pull/3875) — auto-merge armed 13:10Z (12:53Z shard)
+
+## Sentinel + close
+
+`CronList`: `c9705646` armed.
+
+## Visibility signal
+
+- Cron sentinel healthy
+- Stale-auto-merge blocker root-caused on #3871 (rebase needed + MD032 fix needed)
+- Investigation discipline applied per `blocked-green-ci-investigate-threads.md`
+- Server-side rebase API errored twice; local-rebase path deferred for contention reasons
+- Substrate preserved on PR branch regardless of merge outcome
+- 4th multi-Otto contamination observation (HEAD on peer's `*-1156z`)