brain-cache v4.0.9

• Coordinate cleanup and indexing with a lifecycle lock outside index storage.
• Typecheck test fixtures alongside production source and repair outdated mock contracts.
• Backfill missing token counts for unchanged files without re-embedding them.
• Use one history and metadata finalization path for all indexing runs.
• Share crawler and watcher exclusions, honor both ignore files, and reload watch policies when they change.
• Correct manual MCP setup and refresh development and packaged skill guidance.
• Run package-install smoke tests as a separate required CI step.

When upgrading, stop older running indexers before using cleanup: older binaries do not honor the new external lifecycle lock.

Validation: 769 ordinary tests, 3 package-install tests, source and test typechecking, and independent review.