The CLAUDE.md mandatory rule instructed clearing the plugin cache
mid-session, which breaks all MCP tools that were already loaded.
MCP tools are loaded with absolute paths to the venv, and deleting
the cache removes the venv while the session still references it.
Changes:
- CLAUDE.md: Replace "ALWAYS CLEAR CACHE" with "VERIFY AND RESTART"
- verify-hooks.sh: Change cache existence from error to info message
- DEBUGGING-CHECKLIST.md: Add section explaining cache timing
Fixes#145
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>