backlog(B-0558): worktree-pool primitive — re-land of #3817 (BACKLOG.md conflict bypassed) by AceHack · Pull Request #3894 · Lucent-Financial-Group/Zeta

AceHack · 2026-05-16T14:31:54Z

Re-lands the substantive content from PR #3817 (DIRTY/CONFLICTING on `docs/BACKLOG.md` since 07:57Z; armed-but-unmergeable for hours). Server-side `gh pr update-branch --rebase` failed repeatedly; this PR cherry-picks the substrate onto a fresh branch off current main and re-applies the BACKLOG.md insertion manually.

Substrate

`docs/backlog/P3/B-0558-worktree-pool-primitive-per-otto-identity-2026-05-16.md` (new, 102 lines)

Worktree-pool primitive — addresses sub-case 4 (pruned-sidetick race) of `.claude/rules/claim-acquire-before-worktree-work.md`'s borrow-on-existing pattern. Composes with B-0506, B-0519, B-0530.

Empirical anchors (from row body):

Shard PR shard(tick): 2026-05-16T07:15Z otto-cli fresh-cold-boot — shipped attempt #4; saturation-ceiling taxonomy #3808 (`docs/hygiene-history/ticks/2026/05/16/0715Z.md`) — 4-tick-arc evidence
Rule PR rule(claim-acquire): operationalize saturation-ceiling — 4 failure sub-cases #3812 — operationalizes sub-cases 1+2; flags 3+4 as substrate-engineer work

`docs/BACKLOG.md` (+1 line)

Adds the B-0558 entry after B-0557 (which is now `[x]` on main — that's the change that drifted from #3817's tree).

Why not just rebase #3817?

Tried at 13:31Z (`gh pr update-branch --rebase 3817` → `X Cannot update PR branch due to conflicts`) and again at 14:21Z (same result). Local rebase + force-push would work but is risky under multi-Otto contention (3-4 Lior procs + parallel Otto-CLI sessions doing `git switch` on the shared worktree). Re-land on fresh branch is the lower-risk path; content is identical.

Cleanup

#3817 will be closed with a cross-link to this PR once this lands.

…eticks per Otto identity (re-land) Re-lands the substantive content from PR #3817 (DIRTY/CONFLICTING on docs/BACKLOG.md) onto a fresh branch off current main. The file content is unchanged; the BACKLOG.md insertion is manually re-applied to match current main's index state (B-0557 now `[x]`). Substrate addresses sub-case 4 (pruned-sidetick race) of the borrow-on-existing pattern in claim-acquire-before-worktree-work.md. 4 failure sub-cases empirically validated in 0715Z tick arc; sub-cases 3 + 4 need substrate engineering (B-0530 + this row). Original PR #3817 will be closed with cross-link to this PR. Co-Authored-By: Claude <noreply@anthropic.com>

Copilot

Pull request overview

Re-lands backlog item B-0558 documenting a proposed “worktree-pool” primitive (pre-allocated sideticks per Otto identity) and adds it to the generated backlog index, to address the pruned-sidetick race (sub-case 4) described in prior operational substrate.

Changes:

Added new backlog row file B-0558 under docs/backlog/P3/ describing the problem, proposed design, and acceptance criteria.
Updated docs/BACKLOG.md to include the new B-0558 index entry.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
docs/backlog/P3/B-0558-worktree-pool-primitive-per-otto-identity-2026-05-16.md	New P3 backlog row specifying the worktree-pool primitive design + acceptance criteria.
docs/BACKLOG.md	Adds the B-0558 row to the backlog index list.

Two MD032 failures inherited from #3817's original authoring. Added blank lines before the two affected lists in Empirical anchors and Effort estimate sections. Co-Authored-By: Claude <noreply@anthropic.com>

…, type, 0715Z ref, git syntax, B-0506 link, BACKLOG.md regen) All 6 findings verified real. Row file: 4 edits (frontmatter last_updated added; type: feat → feature; 0715Z reference rephrased to acknowledge PR #3808 closed-without-merge; git one-liner split into two commands; B-0506 linked to its file). BACKLOG.md regenerated via bun tools/backlog/generate-index.ts — output byte-identical to prior manual edit (no diff). Co-Authored-By: Claude <noreply@anthropic.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

+Tick 06:43Z-07:18Z (2026-05-16): a fresh-cold-boot Otto-CLI session firing during peer Otto's active cascade took **4 commit attempts** to ship a tick shard. The 4 attempts empirically validated all 4 distinct failure sub-cases of [`.claude/rules/claim-acquire-before-worktree-work.md`](../../../.claude/rules/claim-acquire-before-worktree-work.md)'s borrow-on-existing pattern under sustained multi-Otto saturation:
+
+| # | Sub-case | Mitigation status |
+|---|---|---|
+| 1 | Existing-branch-name reuse → peer-WIP commit inheritance | ✓ uniquified name + git rev-parse pre-check |
+| 2 | Concurrent-WIP-blocked switch | ✓ wait for working-tree-clean window (capacity-limited) |
+| 3 | Pack-dir B-0530 race on `git worktree add` | ✗ NO MITIGATION — needs [B-0530](B-0530-cron-sentinel-mutex-prevent-otto-cli-self-contention-2026-05-15.md) mutex |
+| 4 | Pruned-sidetick race | ✗ NO MITIGATION — needs THIS ROW |
+
+Empirical anchors:
+
+- Shard PR [#3808](https://github.com/Lucent-Financial-Group/Zeta/pull/3808) — the 4-tick-arc evidence (PR closed-without-merge; the `0715Z.md` shard never landed on `origin/main`, only in the PR's branch history per [`lost-files-surface.md`](../../../.claude/rules/lost-files-surface.md))
+- Rule PR [#3812](https://github.com/Lucent-Financial-Group/Zeta/pull/3812) — operationalizes sub-cases 1+2 mitigations into rule body, flags 3+4 as needing substrate-engineer work


…-model rule (#3896) Empirical anchor 2026-05-16T15:14Z: PR #3894 merged at 15:11Z was invisible to `git log origin/main --since="20 min ago"` because squash-merge preserves the original commit-date (author-date), not merge-date. `--since` filters on author- date and drops PRs squashed from older branches. Mitigation: prefer `git log origin/main | head -N` over `--since="X min ago"` for recent-merge queries. Co-authored-by: Claude <noreply@anthropic.com>

Same FP class as #3894's lint fix. Adds blank line after the 'Either:' lead-in. Co-Authored-By: Claude <noreply@anthropic.com>

…#3823 closed + #3817 deferred (#3883) * shard(tick): 2026-05-16T13:31Z — stale-armed-PR triage: #3871 merged + #3823 closed + #3817 deferred Continuing investigation-then-act discipline from 13:10Z tick: - #3871 (12:07Z+12:11Z bundle) self-resolved + merged - #3823 closed as redundant (0758Z.md already on main) - #3817 deferred (BACKLOG.md conflict needs manual rebase) No multi-Otto contamination this tick. Audit cycle 38/38 holds. Co-Authored-By: Claude <noreply@anthropic.com> * fix: MD032 blank-line before list in 1331Z.md line 25 Same FP class as #3894's lint fix. Adds blank line after the 'Either:' lead-in. Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>

…3901) Today's session produced 3 distinct instances where forced escalation at brief-ack #6 (or pre-emptive at #5) surfaced substantive work the brief-ack-only ticks had missed: - 14:56Z #6 → PR #3894 hid 6 Copilot findings (22 min stale) - 15:29Z pre-emptive #5 → PR #3883 (own) stale-armed 108 min - 15:45Z #6 → PR #3545 forward-signal comment (19+ hr stale) Pattern observation worth carving into the rule's empirical- anchor section so future-Otto inherits the validated discipline: the counter forces invocation of investigation discipline on regular cadence, which IS where the hidden work is. Co-authored-by: Claude <noreply@anthropic.com>

Copilot AI review requested due to automatic review settings May 16, 2026 14:31

AceHack enabled auto-merge (squash) May 16, 2026 14:32

AceHack mentioned this pull request May 16, 2026

backlog(B-0558): worktree-pool primitive — pre-allocated isolated sideticks per Otto identity #3817

Closed

Copilot started reviewing on behalf of AceHack May 16, 2026 14:32 View session

Copilot AI reviewed May 16, 2026

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AceHack and others added 2 commits May 16, 2026 10:36

fix: MD032 blank-lines around lists in B-0558 file (lines 29 + 89)

4995ba9

Two MD032 failures inherited from #3817's original authoring. Added blank lines before the two affected lists in Empirical anchors and Effort estimate sections. Co-Authored-By: Claude <noreply@anthropic.com>

Copilot AI review requested due to automatic review settings May 16, 2026 15:12

Copilot started reviewing on behalf of AceHack May 16, 2026 15:13 View session

AceHack merged commit 1dc175e into main May 16, 2026
28 checks passed

AceHack deleted the otto-cli-b0558-reland-2026-05-16-1422z branch May 16, 2026 15:14

Copilot AI reviewed May 16, 2026

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AceHack mentioned this pull request May 16, 2026

fix(rules): document --since-on-squash-merge failure in refresh-world-model rule #3896

Merged

AceHack added a commit that referenced this pull request May 16, 2026

fix: MD032 blank-line before list in 1331Z.md line 25

7ede36b

Same FP class as #3894's lint fix. Adds blank line after the 'Either:' lead-in. Co-Authored-By: Claude <noreply@anthropic.com>

This was referenced May 16, 2026

chore(b-0368): decompose Claude Code permissions investigation to B-0532 and B-0533 #3545

Closed

fix(rules): add forced-escalation-finds-hidden-work empirical anchor #3901

Merged

Copilot AI mentioned this pull request May 16, 2026

docs(archive): Lior preservation of merged PRs #3905

Merged

AceHack mentioned this pull request May 16, 2026

fix(rules): document 3 stale-armed-PR resolution patterns in blocked-green-ci rule #3910

Merged

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backlog(B-0558): worktree-pool primitive — re-land of #3817 (BACKLOG.md conflict bypassed)#3894

backlog(B-0558): worktree-pool primitive — re-land of #3817 (BACKLOG.md conflict bypassed)#3894
AceHack merged 3 commits into
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AceHack commented May 16, 2026

Substrate

`docs/backlog/P3/B-0558-worktree-pool-primitive-per-otto-identity-2026-05-16.md` (new, 102 lines)

`docs/BACKLOG.md` (+1 line)

Why not just rebase #3817?

Cleanup

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