docs(retro): pipeline evidence + doc-sync hardening v6.4.0

[intel352]

Post-merge retrospective for PR #73 (v6.4.0, issues #69-72).

Scored from the committed adversarial review reports — the first end-to-end dogfood of #69 (no transcript reconstruction). Key signals:

• Design-phase D1 (phantom-dependency / existing-convention catch) reframed the whole feature; cycle-2 N2 (Step 1e missing from the Autonomous Mode list) was the highest-value catch.
• No gate misses. CI green on first push.
• post-merge-retrospective depends on a project-local skill-activation-audit script that isn't shipped; activation evidence too weak to confirm gates ran #70 dogfooded only partially → surfaced a real residual: record-activity writes a cwd-scoped log that worktree cleanup fragments, so the retro leaned on session memory for the activation table. Logged as plugin follow-up feat: alignment check, Agent Teams, and full autonomy pipeline #1 (anchor the log to git-common-dir, or union worktree logs) — successor to post-merge-retrospective depends on a project-local skill-activation-audit script that isn't shipped; activation evidence too weak to confirm gates ran #70, not a regression.

Docs-only.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a post-merge retrospective document for the v6.4.0 “pipeline evidence + doc-sync hardening” work (PR #73), capturing scored adversarial-review findings, gate/activation evidence, and follow-up items for the kit.

Changes:

• Adds a new retro file documenting outcomes and scored findings for PR #73 / issues #69–72.
• Records gate activation evidence and notes a residual limitation around record-activity log location when worktrees are cleaned up.
• Captures plugin-level follow-ups and project-guidance update status.

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