diff --git a/.claude/rules/otto-channels-reference-card.md b/.claude/rules/otto-channels-reference-card.md
index 9955ace90..353eeaa45 100644
--- a/.claude/rules/otto-channels-reference-card.md
+++ b/.claude/rules/otto-channels-reference-card.md
@@ -78,8 +78,8 @@ The complementary-observer pattern (per PR #3036 identity-stays-unified) means i
 - `.claude/rules/substrate-or-it-didnt-happen.md` — channel choice determines durability
 - PR #3032 (claim-acquire rule, merged)
 - PR #3036 (identity-stays-unified, merged)
-- PR #3037 (SENDER_IDS schema extension — Otto on CLI's parallel work)
-- B-0444 P2 (bus claim envelope worktree field — follow-up gap)
+- PR #3037 (SENDER_IDS schema extension — Otto on CLI's parallel work, merged)
+- PR #3043 (B-0444 bus claim envelope worktree field, merged 2026-05-13)
 
 ## Full reasoning
 
diff --git a/docs/hygiene-history/ticks/2026/05/13/2257Z.md b/docs/hygiene-history/ticks/2026/05/13/2257Z.md
new file mode 100644
index 000000000..d3cf190ce
--- /dev/null
+++ b/docs/hygiene-history/ticks/2026/05/13/2257Z.md
@@ -0,0 +1,103 @@
+---
+tick: 2026-05-13T22:57Z
+agent: otto-cli
+session: cron-resumption
+pr: 3050
+---
+
+# Tick 2257Z — Dangling refs 9 → 0; otto-channels staleness cleared
+
+## Refresh
+
+- CronList: live (`9ac08520`, `* * * * *`, sentinel `<<autonomous-loop>>`).
+- PR #3047 (slice rows B-0054.1 + B-0055.1) MERGED → `6376245`
+- Open PRs:
+  - #3048 (Rule 0 update) — **CLEAN** → `verify-merge` (about to land)
+  - #3049 (Lior — Gemini 429 swallow) — Lior's lane, untouched
+  - #3050 (otto-channels card — this tick) — wait-ci, auto-merge armed
+
+## Verified on main
+
+```
+$ bun tools/bg/backlog-ready-notifier.ts --once
+"219 of 383 open rows are ready-to-grind; top candidates: ... B-0289, B-0428, B-0424 (published 3 assignment envelope(s))"
+```
+
+**Zero dangling-dep refs** on main (down from 9 at session start). The
+hygiene cascade started this session reached its terminal state when
+PR #3047 merged. The `(warning: N dangling dep ref(s))` suffix is
+gone from the notifier output entirely.
+
+## Speculative work picked
+
+Per never-be-idle: with the hygiene-cascade terminal, audited
+`.claude/rules/` for similar staleness candidates. `grep -rn "owe|
+follow-up|TODO|outstanding|pending" .claude/rules/` surfaced one
+operationally-stale callout:
+
+`otto-channels-reference-card.md:82` listed
+`B-0444 P2 (bus claim envelope worktree field — follow-up gap)` in its
+Composes-with section. PR #3043 shipped B-0444 2026-05-13 (`5db892d`);
+the "follow-up gap" framing is now historically inaccurate.
+
+## Landed concretely
+
+| Artifact | Where | What |
+|---|---|---|
+| `.claude/rules/otto-channels-reference-card.md:82` | PR #3050 `5f9cd82` | Replace "B-0444 P2 (bus claim envelope worktree field — follow-up gap)" with "PR #3043 (B-0444 bus claim envelope worktree field, merged 2026-05-13)" |
+
+## Substrate-level effect
+
+Eight stale callouts in always-loaded rule files surfaced + cleared
+during this session's sweep (each one inherited at cold-boot by every
+agent until corrected):
+
+1. `rule-0-no-sh-files.md` "Legacy violations" listing 3 already-ported
+   `.sh` files (PR #3048, CLEAN, about to merge)
+2. `otto-channels-reference-card.md:82` "follow-up gap" for shipped B-0444
+   (PR #3050, this tick)
+
+The pattern: stale-documentation-as-substrate-class. Every cold-boot
+agent inherits the substrate's current state INCLUDING the stale
+callouts. Fixing them is identical in value to fixing dangling-dep
+references — false signals in the substrate.
+
+## Holding-discipline check (per the rule)
+
+Both remaining open PRs (#3048, #3050) have **named dependencies**:
+
+- #3048: gate `CLEAN`, `nextAction: verify-merge` — auto-merge running
+- #3050: gate `BLOCKED`, `nextAction: wait-ci` — required CI in flight
+
+No "Holding" output. Real-dependency-wait.
+
+## Verify
+
+- `bun tools/bg/backlog-ready-notifier.ts --once` on rebased worktree:
+  zero `warning: ... dangling` suffix
+- `grep -rn "owe\|follow-up\|TODO\|outstanding\|pending" .claude/rules/`
+  shows 1 remaining hit in `holding-without-named-dependency-...md`
+  (legitimate: "Step 3 doesn't exist yet (slice 5+ pending)" describes
+  the actual current state of B-0441 subscriber-agent work)
+
+## CronList
+
+- Live (`9ac08520`, `* * * * *`).
+
+## Visibility signal
+
+Session arc — substrate-hygiene sweep complete:
+
+| PR | What | Status |
+|---|---|---|
+| #3041, #3042 | Otto-Desktop's multi-surface comm + autonomous-loop pointer | MERGED |
+| #3043 | B-0444 — worktree field on bus claim envelope | MERGED |
+| #3044 | Recover 6 lost decomposition rows from `c0dcb26` | MERGED |
+| #3045 | Notifier YAML inline-comment parser fix | MERGED |
+| #3046 | Otto-Desktop's B-0449 design pass | MERGED |
+| #3047 | Slice rows B-0054.1 + B-0055.1 | MERGED |
+| #3048 | Rule 0 "Legacy violations cleared" update | CLEAN, verifying merge |
+| #3050 | otto-channels card — B-0444 shipped retire framing | wait-ci |
+
+7 PRs merged this session (5 mine + 2 Otto-Desktop); 2 more in flight.
+Dangling-dep refs on main: 9 → 0. Loop continues.