feat: mothership-backed sdk-review workflow, merge queue, and docs

[vaibhavatlan]

Summary

• Adds .github/workflows/sdk-review.yml — thin GHA workflow that parses @sdk-review comments and dispatches to mothership's rover-native sandbox (replaces the current claude.yml-based review)
• Adds .github/workflows/merge-queue.yml — auto-updates and auto-merges approved PRs in FIFO order (replaces branch-keeper)
• Adds .mothership/review.yaml — repo config for the SDK reviewer snapshot
• Updates docs/agents/review.md — documents the new mothership-backed review flow
• Updates docs/agents/testing.md — adds reviewer test expectations
• Updates docs/agents/coding-standards.md — adds Temporal determinism and contract evolution sections

Context

Companion to atlanhq/mothership#549 which adds the sdk-reviewer and sdk-evolution rover snapshots.

Invocation

Command	What it does
@sdk-review	Review only
@sdk-review auto-complete	Review + auto-fix loop (max 3 iter)
@sdk-review challenge: <reason>	Re-evaluate disputed findings
@sdk-review override: <reason>	Admin force-pass
@sdk-review stop	Cancel in-progress review

Test plan

• Verify GHA workflow triggers on @sdk-review comment
• Verify dispatch reaches mothership (requires atlanhq/mothership#549 deployed)
• Verify merge-queue updates behind branches after a merge to main
• Verify merge-queue labels needs-rebase on conflicts

🤖 Generated with Claude Code

[snykgituser]

✅ Snyk checks have passed. No issues have been found so far.

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[Aryamanz29]

v3 relevance check: ✅ Active — mothership-backed sdk-review workflow. @vaibhavatlan is this still on track for merge?