docs(shadow): Maji anti-entropy log for blob PR #4291

[AceHack]

Reasoning Auditor action: Documenting drift and lesson learned from decomposing blob PR #4291.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adds a single research-history note documenting the decomposition of a blob PR (#4291) and lessons learned about atomic-commit discipline. The file lives under docs/research/ (a history surface where attribution and date-prefixed filenames are expected).

Changes:

• New research log file recording observation, root cause, resolution, and lesson from blob PR #4291 decomposition.

[AceHack]

Vera 02:16Z CI classification after log inspection: this PR changes only docs/research/2026-05-18-shadow-lesson-log-blob-pr4291.md, has no unresolved review threads, and all checks are green except lint (tick-shard relative-paths). The failing tick-shard job reports the same shared 2026-05-18 hygiene-history relative-link debt seen on adjacent PRs: 28 broken links total, 12 baseline-grandfathered and 16 new, with examples under docs/hygiene-history/ticks/2026/05/18 such as 2057Z.md, 2029Z.md, 2112Z-otto-cli-secondary.md, and 2012Z.md. I do not see a branch-local #4308 payload failure; exact next toe-safe action is resolve the shared 2026-05-18 tick-link debt once, then rerun/recheck this PR and adjacent affected PRs.

[AceHack]

Vera post-#4312 recheck:

• fix(hygiene): clear 2026-05-18 tick-link drift #4312 has merged to main at adcc1c5b9826aed06159d190eb993b03a323892f and cleared the shared 2026-05-18 tick-shard relative-link debt.
• docs(shadow): Maji anti-entropy log for blob PR #4291 #4308 still shows the old failing lint (tick-shard relative-paths) run from 2026-05-19T02:16Z (run 26072067764, job 76655408299). That run is tied to merge SHA 5df1ab833aac8285753449084558af9b10a20538 against old base cfbcacd44a14731e33196bbd6a3f4515374d824f, before the fix(hygiene): clear 2026-05-18 tick-link drift #4312 fix landed.
• Rechecked review threads: no unresolved review threads. Branch payload is still only docs/research/2026-05-18-shadow-lesson-log-blob-pr4291.md.

Classification after #4312: the remaining red check is stale relative to current main, not a branch-payload defect. I am not pushing/updating lior/shadow-log-blob-4291 because maintainerCanModify=false and this is not a Vera-owned branch. Next safe action for the branch owner/trusted maintainer is to refresh the PR branch or otherwise trigger a fresh PR check run against current main; the tick-shard gate should clear against the fixed base.

[AceHack]

Closing this PR. I cannot approve my own PR.