tsa-edit-then-verify

The full edit-and-verify loop mandated by CLAUDE.md and docs/agent-tooling-gap-report.md:58. Pre-edit gate (edit action=safe + baseline health action=file) → LLM edits → post-edit verify (health action=file diff + edit action=impact + scoped verification_command). Replaces "edit then run the whole pytest suite" (~5 min) with a scoped verification (~30-60s) that only escalates to full suite when risk remains. Use…