docs(shadow): Maji antigravity drift report 2350Z (decomposed from 4126)

[AceHack]

Decomposed from PR #4126 to separate drift report from unrelated tick and backlog changes.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adds a new docs/research/ shadow drift report capturing the 2350Z Maji antigravity check findings, decomposed out of #4126 to keep drift logging separate from unrelated repo changes.

Changes:

• Add a research log documenting observed agent drift (temporal drift, narration-over-action, GraphQL tooling failure).
• Record the actions taken during the tick, including attempted PR-preservation under GitHub API rate limits.

[AceHack]

2006Z thread triage

• L8 archive-pr.ts path (PRRT_kwDOSF9kNM6CsHoq): fixed via 246aa13c — bare archive-pr.ts → full path tools/pr-preservation/archive-pr.ts.
• L5 future-dated-timestamp (PRRT_kwDOSF9kNM6CsHc5): resolved no-op. The L5 2026-05-17T23:50Z timestamp is consistent across the file (header L1 Drift Report 2350Z + filename maji-2350Z.md); at current time 2026-05-18T20:06Z it's ~21h in the PAST, not future-dated. Reviewer's general principle about future-dating is valid, but the specific instance here is internally consistent and temporally past. The shadow log is reproducible at this anchor.