diff --git a/docs/pr-discussions/PR-3945-fix-b-0441-re-open-per-parent-child-status-invariant-b-0532.md b/docs/pr-discussions/PR-3945-fix-b-0441-re-open-per-parent-child-status-invariant-b-0532.md
new file mode 100644
index 000000000..033a9dc24
--- /dev/null
+++ b/docs/pr-discussions/PR-3945-fix-b-0441-re-open-per-parent-child-status-invariant-b-0532.md
@@ -0,0 +1,210 @@
+---
+pr_number: 3945
+title: "fix(B-0441): re-open per parent-child status invariant (B-0532)"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-16T21:25:54Z"
+merged_at: "2026-05-16T22:54:23Z"
+closed_at: "2026-05-16T22:54:23Z"
+head_ref: "chore/b-0441-status-closed-2026-05-16"
+base_ref: "main"
+archived_at: "2026-05-16T23:29:09Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #3945: fix(B-0441): re-open per parent-child status invariant (B-0532)
+
+## PR description
+
+## Summary
+
+Restores B-0441 to `status: open` to satisfy the `--enforce-parent-child-status` lint (B-0532 gate). PR #3942 closed B-0441 while child B-0460 (slice 5.2 — subscriber handler) was still open; the lint failure surfaced this correctly but auto-merge fired anyway because the lint check isn't in the required-checks list.
+
+This PR brings origin/main back to parent-child consistency.
+
+## Why the previous close was wrong
+
+The 2026-05-16 acceptance-refresh PR (#3942) marked 6 stale unchecked acceptance boxes as `[x]` correctly — the notifier-side IS fully implemented. But it ALSO flipped `status: closed`, which violated the parent-child invariant because `children: [B-0500, B-0501, B-0502, B-0460]` includes one open child (B-0460).
+
+The audit output was unambiguous:
+
+```
+## 9. Parent-child status mismatch (B-0532)
+Parent-child status-mismatch groups: 1
+- B-0441 (closed) has open children:
+- Re-open the parent if the children represent unfinished work, OR
+- Remove the child refs from the parent's `children:` if they no longer apply
+error: 1 parent-child status-mismatch group(s) found; --enforce-parent-child-status set (B-0532 gate)
+```
+
+I picked "re-open the parent" because B-0460 IS unfinished work (subscriber handler scope is genuinely different from notifier scope; both lanes are legitimate).
+
+## Diff
+
+- `docs/backlog/P1/B-0441-*.md`:
+ - `status: closed` → `status: open` (one line)
+ - Added a new `## Closure status (2026-05-16)` section explaining notifier-side is complete (acceptance refresh stands) but row stays open per parent-child invariant until B-0460 lands
+- `docs/BACKLOG.md`: regenerated — flips back `[x] → [ ]` for B-0441 line
+
+## Test plan
+
+- [ ] `lint (backlog parent-child status)` passes (verified locally: 0 mismatch groups)
+- [ ] Audit doesn't surface any new violations
+- [ ] When B-0460 lands later, a follow-up PR can flip B-0441 to closed without further substrate work
+
+## Open question for human maintainer
+
+The `lint (backlog parent-child status)` check failed on PR #3942 but auto-merge fired anyway. This suggests the check is NOT in the required-checks list. If parent-child consistency matters (the B-0532 design implies it does), the check should likely be required. That's a separate decision — flagging for awareness, not addressing here.
+
+🤖 Generated with [Claude Code](https://claude.com/claude-code)
+
+## Reviews
+
+### COMMENTED — @chatgpt-codex-connector (2026-05-16T21:27:50Z)
+
+
+### 💡 Codex Review
+
+Here are some automated review suggestions for this pull request.
+
+**Reviewed commit:** `8e8f1611ca`
+
+
+ ℹ️ About Codex in GitHub
+
+
+[Your team has set up Codex to review pull requests in this repo](https://chatgpt.com/codex/cloud/settings/general). Reviews are triggered when you
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+- Mark a draft as ready
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+
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+
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+
+
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-16T21:29:20Z)
+
+## Pull request overview
+
+This PR restores backlog parent/child status consistency by re-opening **B-0441** (parent) while child work (notably B-0460) remains open, and updates the generated backlog index accordingly.
+
+**Changes:**
+- Re-opened B-0441 (`status: open`) and updated `last_updated` to 2026-05-16.
+- Added a “Closure status (2026-05-16)” note to explain why the row remains open despite progress.
+- Regenerated `docs/BACKLOG.md` to reflect the row’s open status.
+
+### Reviewed changes
+
+Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.
+
+| File | Description |
+| ---- | ----------- |
+| docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md | Re-opens the parent row and adds a closure/status explanation section. |
+| docs/BACKLOG.md | Regenerated index reflecting B-0441 as open. |
+
+
+
+Comments suppressed due to low confidence (1)
+
+**docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md:184**
+* The closure note says the notifier-side is complete and that all acceptance criteria are checked, but the parent acceptance list includes the assignment-history cooldown criterion (slice 5a) which is still tracked as open in B-0501 and not implemented in `tools/bg/backlog-ready-notifier.ts`. Update this note to reflect the remaining unshipped notifier-side work, or align the acceptance checklist/child statuses with what’s actually shipped.
+```
+## Closure status (2026-05-16)
+
+**Notifier-side: complete.** All 8 acceptance criteria checked (slices 1, 2, 3, 4, 5a, 6 shipped per the decomposition table; tests in `tools/bg/backlog-ready-notifier.test.ts`; launchd plist via B-0502; docs in `docs/AUTONOMOUS-LOOP.md`). Empirically confirmed live during the 2026-05-16 session via `bun tools/bg/backlog-ready-notifier.ts --once` — returned the documented JSON shape with `queueBusy: true` correctly suppressing publication.
+
+**Row stays `status: open`** because child **B-0460** (slice 5.2, agent-side subscriber handler) is genuinely the remaining unshipped scope, and the `--enforce-parent-child-status` lint (B-0532 gate) correctly requires parent rows to stay open while any child is open. Closing this row would violate that invariant.
+```
+
+
+### COMMENTED — @chatgpt-codex-connector (2026-05-16T21:32:07Z)
+
+
+### 💡 Codex Review
+
+Here are some automated review suggestions for this pull request.
+
+**Reviewed commit:** `096774ea47`
+
+
+ ℹ️ About Codex in GitHub
+
+
+[Your team has set up Codex to review pull requests in this repo](https://chatgpt.com/codex/cloud/settings/general). Reviews are triggered when you
+- Open a pull request for review
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+
+If Codex has suggestions, it will comment; otherwise it will react with 👍.
+
+
+Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".
+
+
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-16T21:40:20Z)
+
+## Pull request overview
+
+Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
+
+### COMMENTED — @AceHack (2026-05-16T22:20:36Z)
+
+_(no body)_
+
+### COMMENTED — @AceHack (2026-05-16T22:20:38Z)
+
+_(no body)_
+
+## Review threads
+
+### Thread 1: docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md:54 (resolved)
+
+**@chatgpt-codex-connector** (2026-05-16T21:27:50Z):
+
+** Keep slice 5a acceptance unchecked until implemented**
+
+This change marks the "Tracks assignment history ..." criterion as shipped, but the referenced child row `docs/backlog/P1/B-0501-b0441-slice-5-assignment-history-dedup-cooldown-2026-05-14.md` is still `status: open` with unchecked acceptance items, and the notifier implementation (`tools/bg/backlog-ready-notifier.ts`) still has no `historyFile`/cooldown dedup path. Marking this as complete can cause reviewers and automation to treat slice 5a as finished and skip the remaining implementation work.
+
+Useful? React with 👍 / 👎.
+
+### Thread 2: docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md:54 (resolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T21:29:20Z):
+
+This marks the assignment-history dedup/cooldown acceptance criterion as shipped and references B-0501 as shipped, but B-0501 is still `status: open` with unchecked acceptance criteria, and `tools/bg/backlog-ready-notifier.ts` currently contains no history/cooldown logic. This should stay unchecked (or update the child row/status + implementation first) to avoid overstating what’s implemented.
+
+This issue also appears on line 180 of the same file.
+
+### Thread 3: docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md:182 (resolved)
+
+**@chatgpt-codex-connector** (2026-05-16T21:32:07Z):
+
+** Don’t declare slice 5a shipped while child B-0501 is open**
+
+The new closure note says notifier-side work is complete and explicitly lists slice 5a as shipped, but child row `B-0501` is still `status: open` with all acceptance items unchecked (`docs/backlog/P1/B-0501-b0441-slice-5-assignment-history-dedup-cooldown-2026-05-14.md`). This creates contradictory backlog state that can mislead reviewers/automation into treating dedup-cooldown work as finished when it is still tracked as unfinished; either the shipped claim needs to be removed here or B-0501 needs to be actually closed with implemented criteria.
+
+Useful? React with 👍 / 👎.
+
+### Thread 4: docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md:184 (resolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T21:40:19Z):
+
+P1: Slice/acceptance status is internally inconsistent after marking slice 5a as open. The new slice table and closure section say 5a (B-0501) is not shipped, but this same row’s acceptance criteria still has the assignment-history item checked and labeled “B-0501 shipped”. Update the acceptance checklist (and any “live slices” statements) so it matches B-0501’s current `status: open` + unchecked acceptance criteria.
+
+**@AceHack** (2026-05-16T22:20:36Z):
+
+Verified — slice 5a (B-0501) is `status: open`; the acceptance checkbox + label was inherited from the prior version of this row. Fixed in d0ea0581: line 53-54 now unchecked and labeled `B-0501 open` with the substrate-honest note that `historyFile`/cooldown logic is not yet in `tools/bg/backlog-ready-notifier.ts`. Acceptance section now matches the slice table on line 173.
+
+### Thread 5: docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md:188 (resolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T21:40:20Z):
+
+P1: The closure note “When B-0501 and B-0460 land and close, this row is ready to flip to closed” appears incomplete given the enforced parent/child invariant: all children must be in a closed status. Today B-0502 is `status: shipped` (not one of the documented closed statuses in tools/backlog/README.md, and not treated as closed by tools/hygiene/audit-backlog-items.ts), so closing B-0441 later would still fail unless B-0502 is also moved to a closed status (or the closed-status set is updated). Clarify this in the closure guidance.
+
+**@AceHack** (2026-05-16T22:20:37Z):
+
+Verified — `shipped` is NOT in `CLOSED_STATUSES` (`{closed, landed, superseded, merged, done}` per `tools/hygiene/audit-backlog-items.ts:245`) and is NOT in the documented enum (`open / closed / superseded-by-B-NNNN / deferred / decomposed` per `tools/backlog/README.md:63`). Closure guidance updated in d0ea0581: line 188 now flags the B-0502 `shipped` status mismatch explicitly and names the two resolution paths (flip B-0502 to a documented closed status, OR extend `CLOSED_STATUSES` + README enum to recognize `shipped`).
diff --git a/docs/pr-discussions/PR-3949-feat-b-0156-phase-6-py-policy-ci-gate-no-python-files-lint.md b/docs/pr-discussions/PR-3949-feat-b-0156-phase-6-py-policy-ci-gate-no-python-files-lint.md
new file mode 100644
index 000000000..fb5e1ccfe
--- /dev/null
+++ b/docs/pr-discussions/PR-3949-feat-b-0156-phase-6-py-policy-ci-gate-no-python-files-lint.md
@@ -0,0 +1,172 @@
+---
+pr_number: 3949
+title: "feat(B-0156): Phase 6 .py policy CI gate \u2014 no-python-files lint"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-16T21:59:09Z"
+merged_at: "2026-05-16T22:02:07Z"
+closed_at: "2026-05-16T22:02:07Z"
+head_ref: "otto-cli/b0156-phase6-no-python-lint-2026-05-16"
+base_ref: "main"
+archived_at: "2026-05-16T23:29:08Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #3949: feat(B-0156): Phase 6 .py policy CI gate — no-python-files lint
+
+## PR description
+
+## Summary
+
+Smallest safe slice of [B-0156](../backlog/P1/B-0156-typescript-standardization-non-install-scripts-aaron-2026-05-01.md) (TypeScript standardization). Closes Phase 6 — `.py` policy CI enforcement.
+
+Substrate-drift discriminator at session start confirmed Phases 1-5 = DONE (all six named non-install `.sh` files already ported to `.ts` and deleted; `tools/profile.ts`, `tools/peer-call/amara.ts`, `tools/peer-call/ani.ts`, `tools/hygiene/{snapshot,check}-github-settings.ts`, `tools/hygiene/check-tick-history-shard-schema.ts` all exist). Phase 6 (`.py` policy enforcement) was the only outstanding acceptance bullet.
+
+## What lands
+
+- **`tools/lint/no-python-files.ts`** — TS+Bun lint (per Rule 0: no `.sh` outside install graph). Walks the tree, hard-excludes `references/upstreams`, `.venv`, `__pycache__`, `site-packages`, `tools/lean4/.lake`, `node_modules`, `bin/obj`. Reads `tools/lint/no-python-files.allowlist` for explicit exceptions. Exit 0 clean / 1 flagged / 2 allowlist-missing.
+- **`tools/lint/no-python-files.allowlist`** — starts empty (current repo state: 0 `.py` files in our scope, matching the row's audit baseline). Legitimate exceptions land here with reason comments.
+- **`tools/lint/no-python-files.test.ts`** — 9 `bun test` unit tests against synthetic trees (clean / flagged / allowlisted / each hard-exclude segment / `--list` mode / comment-line handling / missing-allowlist).
+- **`.github/workflows/gate.yml`** — new `lint-no-python-files` job adjacent to `lint-no-empty-dirs`, same shape (3-min timeout, install toolchain, run lint). No untrusted input in `run:` lines.
+- **Backlog row** — Phase 6 marked DONE; `last_updated: 2026-05-16`.
+- **Tick shard** — `docs/hygiene-history/ticks/2026/05/16/2157Z.md`.
+
+## Focused checks
+
+| Check | Outcome |
+|---|---|
+| `bun test tools/lint/no-python-files.test.ts` | 9 pass / 0 fail / 15 expect() calls |
+| `bun tools/lint/no-python-files.ts` (real repo) | `OK (0 allowlisted, 0 flagged)` — exit 0 |
+| `bun tools/lint/no-empty-dirs.ts` (regression check after adding new files) | green |
+| `js-yaml` parse of `.github/workflows/gate.yml` | 17 jobs, `lint-no-python-files` present |
+| `git ls-tree HEAD \| wc -l` vs `origin/main` (broken-commit canary) | 53 vs 53, OK |
+
+## Test plan
+
+- [ ] CI gate.yml runs `lint-no-python-files` step — green on this PR (0 `.py` files in scope)
+- [ ] No regression on existing `lint-no-empty-dirs` or other lint jobs
+- [ ] Backlog index regen produced byte-identical `docs/BACKLOG.md` (verified locally; no diff)
+
+## Composes with
+
+- B-0156 acceptance criterion 4 (`.py` policy lint added to gate.yml)
+- Rule 0 (TS over bash for non-install scripts) — implementation IS TS, not the inline `find` bash the row had drafted
+- `no-empty-dirs.ts` template — same allowlist + hard-exclude + posix-rel + bun-test patterns
+
+🤖 Generated with [Claude Code](https://claude.com/claude-code)
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-16T22:02:12Z)
+
+## Pull request overview
+
+Adds a Bun/TypeScript CI lint gate for B-0156 Phase 6 to prevent first-party `.py` files outside approved exclusions/allowlist.
+
+**Changes:**
+- Adds `no-python-files` lint tool, allowlist, and Bun tests.
+- Wires the lint into `gate.yml`.
+- Updates backlog/tick documentation for the completed phase.
+
+### Reviewed changes
+
+Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.
+
+
+Show a summary per file
+
+| File | Description |
+| ---- | ----------- |
+| `tools/lint/no-python-files.ts` | Implements the `.py` file scanner and policy enforcement. |
+| `tools/lint/no-python-files.test.ts` | Adds unit tests for lint outcomes and exclusions. |
+| `tools/lint/no-python-files.allowlist` | Documents the explicit allowed `.py` path list. |
+| `.github/workflows/gate.yml` | Adds the CI job that runs the new lint. |
+| `docs/backlog/P1/B-0156-typescript-standardization-non-install-scripts-aaron-2026-05-01.md` | Marks Phase 6 complete and updates status details. |
+| `docs/hygiene-history/ticks/2026/05/16/2157Z.md` | Records the implementation tick for this phase. |
+
+
+
+
+Comments suppressed due to low confidence (1)
+
+**tools/lint/no-python-files.ts:62**
+* This second `spawnSync("git", ...)` has the same SonarJS issue as the `repoRoot()` call: TypeScript tools in this repo suppress `sonarjs/no-os-command-from-path` with a short rationale when intentionally invoking `git` from PATH. Without that, the new tool is likely to break the TypeScript lint gate.
+```
+ const result = spawnSync("git", ["check-ignore", "--stdin"], {
+```
+
+
+### COMMENTED — @chatgpt-codex-connector (2026-05-16T22:02:32Z)
+
+
+### 💡 Codex Review
+
+Here are some automated review suggestions for this pull request.
+
+**Reviewed commit:** `72ab8dc69c`
+
+
+ ℹ️ About Codex in GitHub
+
+
+[Your team has set up Codex to review pull requests in this repo](https://chatgpt.com/codex/cloud/settings/general). Reviews are triggered when you
+- Open a pull request for review
+- Mark a draft as ready
+- Comment "@codex review".
+
+If Codex has suggestions, it will comment; otherwise it will react with 👍.
+
+
+Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".
+
+
+
+## Review threads
+
+### Thread 1: tools/lint/no-python-files.ts:52 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T22:02:11Z):
+
+This `spawnSync("git", ...)` call will trip the repo's SonarJS `sonarjs/no-os-command-from-path` rule. Existing TypeScript tools that shell out to `git` document the intentional PATH lookup with an eslint-disable comment (for example, `tools/lint/no-empty-dirs.ts` does this before its matching `repoRoot()` call), so this new lint likely fails `npm run lint:typescript` unless the suppression/rationale is added.
+
+This issue also appears on line 62 of the same file.
+
+### Thread 2: tools/lint/no-python-files.test.ts:15 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T22:02:11Z):
+
+The test helper also invokes `git` via `spawnSync` without the repo-standard `sonarjs/no-os-command-from-path` suppression/rationale. Because tests are included in `eslint .`, this new test file can fail the TypeScript lint job even though the Bun tests pass.
+
+### Thread 3: tools/lint/no-python-files.ts:203 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T22:02:11Z):
+
+This user-facing lint message carries a human-maintainer name/date attribution. Outside the repo's history surfaces, the established convention is to use role references instead of direct names, so keep the policy reference but remove or role-phrase the attribution here.
+
+### Thread 4: tools/lint/no-python-files.ts:230 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T22:02:12Z):
+
+Filtering candidates through `git check-ignore` creates a bypass for committed `.py` files that are force-added under an ignored path (for example a checked-in file under `drop/` or `coverage/` would be present in CI but removed from `filtered`). This gate is described as enforcing committed `.py` policy, so it should either enumerate tracked files or distinguish tracked ignored files from untracked ignored scratch before suppressing them.
+
+### Thread 5: tools/lint/no-python-files.allowlist:14 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T22:02:12Z):
+
+This allowlist documentation overstates the hard exclude: the script hard-excludes only `tools/lean4/.lake` by prefix, not every `.lake` directory. A contributor could rely on this comment and assume another `.lake` tree does not need an allowlist entry, so either name the exact prefix here or add `.lake` as a segment hard-exclude.
+
+### Thread 6: .github/workflows/gate.yml:884 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-16T22:02:12Z):
+
+This workflow comment also says `.lake` is hard-excluded, but the script only hard-excludes `tools/lean4/.lake`. Please keep the CI comment aligned with the actual exclusion scope so reviewers know which paths the gate really skips.
+
+### Thread 7: tools/lint/no-python-files.ts:120 (unresolved)
+
+**@chatgpt-codex-connector** (2026-05-16T22:02:32Z):
+
+** Detect Python extensions case-insensitively**
+
+`findPythonFiles()` only flags names ending with lowercase `.py`, so a committed file like `scripts/tool.PY` or `tool.Py` is treated as non-Python and the new CI job passes even though policy intent is to block Python files. This creates a straightforward bypass of the enforcement introduced in this commit; normalize the filename case (or use a case-insensitive suffix check) before testing the extension.
+
+Useful? React with 👍 / 👎.