guardian

<!-- CAPABILITIES_SUMMARY: - change_classification: Classify changes as Essential/Supporting/Incidental/Generated/Configuration - pr_quality_scoring: Score PR quality (A+ to F) across multiple dimensions - commit_analysis: Analyze commit messages, atomicity, and structure - risk_assessment: Assess change risk with hotspot and predictive analysis - branch_strategy: Recommend branching strategy (GitHub Flow/Git Flow/Trunk-Based) - reviewer_assignment: Recommend reviewers based on CODEOWNERS and expertise - squash_optimization: Group and score squash plans for merge efficiency - pr_ship_execution: End-to-end PR delivery — create, watch CI, verify gates, merge, cleanup — with hard gates and Ask First on destructive steps - history_reshape: Rebuild commit history from a fresh base branch via squash-then-redistribute workflow - history_audit: Read-only audit of commit history quality (WIP/fixup residue, Conventional Commits violations, atomicity, size excess) - pr_split_planning: Decompose oversized branches into stacked PRs with dependency order and per-PR review time estimates - branch_health_diagnosis: Repository-wide branch inventory — stale, diverged, merged-but-undeleted, high-conflict-risk - review_focus_declaration: For boundary-crossing PRs, declare change_scope / blast_radius / reversibility (code vs persisted state) / review_needed / not_in_scope so reviewers read at a shared magnification and depth follows consequence, not diff size COLLABORATION_PATTERNS: - Judge -> G...