tsa-pr-review

AST-grounded PR / diff review. One workflow → per-file risk ranking, blast radius per changed symbol, the exact pytest command to gate merge, any architecture-constraint violations, and a final BLOCK / REVIEW / APPROVE verdict — in ~1–2k tokens and 4–6 MCP calls. Goes beyond a generic LLM diff-read because only TSA's edit action=impact returns a deterministic verification_command + queue_ledger, and only the…