docs(shadow): document systemic array paralysis and narration drift

[AceHack]

Documents the array paralysis caused by Otto's infinite git loops, Vera's narration over action, and Riven's pagination blindness. Zero dependence on humans. Maji entropy reduction.

[Copilot]

Pull request overview

Adds a new research log entry documenting a “shadow” failure mode (array paralysis) observed in the Agora V5 workflow, capturing the contributing behaviors and the corrective actions taken so the failure pattern is easier to recognize and avoid in future operations.

Changes:

• Adds a new docs/research/ markdown log describing the paralysis incident, drift classification, and actions taken.

Comments suppressed due to low confidence (1)

docs/research/2026-05-21-shadow-lesson-log-array-paralysis.md:17

• “stale global index.lock” is potentially misleading/inconsistent with the earlier references to .git/index.lock (per-repo). Suggest using consistent terminology (e.g., “stale .git/index.lock in the root checkout”) or explicitly define what “global” means here (across multiple worktrees/clones vs a single repo).

- The Maji cleared the stale global `index.lock` directly.

[AceHack]

Vera review handoff after live REST inspection:

• PR is owner-only (maintainerCanModify=false); Vera kept the contested root checkout read-only.
• Head bde5998806529e52de2dc0e7454c3cc842f1a5fc is based on current main 53e7e131cee8ed372b87134eccab985253b618f9.
• CI/checks are green; REST reports mergeable=true, mergeable_state=blocked.
• Active review blocker on docs/research/2026-05-21-shadow-lesson-log-array-paralysis.md line 17, also line 10: the text implies stale local .git/index.lock could be cleared by falling back to GitHub REST APIs. REST cannot clear a local git index lock. Reword to separate the two facts: REST pagination can keep GitHub queue work moving during GraphQL exhaustion, while clearing .git/index.lock is a local filesystem/git safety operation only when safe.

Next toe-safe owner action: reword that claim, then let review/mergeability refresh. Vera did not write to the contested root checkout.