docs(patterns): operationalize auto-review runbook + verify-before-claiming + node-signature convention

[POWERFULMOVES]

Operationalizes this session's review-infra learnings into .claude/PATTERNS.md (the loaded Known-Roads/debug-recipes doc) so they're enforced in operations, not just memory — per the request to "ensure not just in memory but in operations."

Adds to PR Review & Merge Workflow:

• Verify-before-claiming — never assert "X fixed" without running the real qualifying case; use the verifier subagent. (Earned: a version bump was asserted to fix the auto-review outage twice before a real PR proved it didn't.)
• claude-code-review.yml failure-signature triage table — the 3 signatures + fixes: 4s oven-sh/setup-bun allowlist (version bump does NOT fix it), benign 40s Workflow validation failed 401 (PR edits the workflow → ignore, clears on main), bot-trigger default-deny (allowed_bots).
• Node-signature convention — primary + 1M-context mirror can both sign 4090-CLAUDE; union-merge racing claims, disambiguate the signature so claim-collision-agent can tell lanes apart.

Pure docs; no behaviour change.

Note (and a live demonstration of the runbook itself): this PR touches only .claude/PATTERNS.md, which is not in the widened review path filter (#1787 added .claude/agents|skills/**, not docs), so claude-review will not fire here — by design, doc edits aren't code-reviewed. The pipeline was already verified live on #1785 (a clean 4m27s claude-review run on an agents PR).

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: f9c1176c-f644-428b-97a4-165dafdd1922

📥 Commits

Reviewing files that changed from the base of the PR and between 528c3b7 and 3b629bd.

📒 Files selected for processing (1)

• .claude/PATTERNS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ops/auto-review-runbook

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