kami 1df7af5b85 feat(kernel): brief echo-back gate (C-A1)
- BriefEcho model + BriefEchoMismatchEvent (registered + serialization test)
- BriefEchoExtractor: parses the planner's brief_echo block and the original
  brief's referenced-files/symbols/acceptance-criteria dimensions
- BriefEchoComparator: conservative diff — a dropped acceptance criterion or an
  invented file path halts; dropping a file/symbol alone does not
- checkBriefEcho gate chained into the post-stage flow after groundBriefReferences;
  opt-in via stageConfig.metadata["briefEcho"], fails the stage (retryable) on
  divergence with re-grounding feedback
- prompt/workflow activation (planner.md emitting brief_echo; role_pipeline
  metadata) left as live-QA follow-up

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-20 10:42:49 +00:00
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