v0.39.1

Fixed

• Plannotator gate now works end-to-end — new plannotator tool registered
  via pi.registerTool bypasses the bash block in gate stage. Writes receipt
  automatically on approval. turn_end auto-advances on receipt detection.

Changed

• stages.yaml: gate/int-gate block only bash — edit/write
  unblocked (needed for frontmatter stamp + receipt creation).
• gates_passed removed — declared in 22+ files but never populated.
  Replaced by direct receipt file detection. No stale state.
• gate.md rewritten — uses plannotator tool, no manual receipt step.
• Reference docs updated — tool path primary, CLI fallback secondary.

Added

• sem tool docs — entity-level diff for Execution Critique.