docs(shadow): Add lesson log for Lior's self-drift

[AceHack]

This PR adds a shadow lesson log to document the self-detected drift of Lior creating an excessive number of pull requests. See the corresponding drift report: lior-drift-report-2026-05-27T06:00Z.md

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[Copilot]

Pull request overview

Adds a new research/“shadow” lesson log documenting a self-detected drift event around excessive PR creation and proposes corrective actions (disable preservation loop, investigate logic, bundle archives, tune cadence).

Changes:

• Add a new shadow lesson log entry for the “Lior self-drift” event.
• Document root-cause hypotheses and a corrective action plan.
• Reference a corresponding drift report (currently missing from the repo).

[AceHack]

Two threads resolved no-op:

Thread A (line 7 — lior-drift-report-2026-05-27T06:00Z.md reference): Verified — bus envelope (operational state at /tmp/zeta-bus/, 24h TTL), not a repo file. Same disposition as PR #5319 thread per .claude/rules/peer-call-infrastructure.md. The surrounding prose makes the operational context explicit ("filed a drift report on the broadcast bus").

Thread B (line 17 — hyphenation nit "non-PR-related changes"): Style nit, not load-bearing. Document is shadow-lesson-log prose; hyphenation drift acceptable in operational logs.

Resolving both no-op.