Tools:
- feat: list_events — calendar event listing with date range filter,
  result cap (default 50, max 200), input validation, TB 128 batch API support
- fix: get_message — apply sanitizeStr() to body, subject, author, recipients, ccList
- fix: search_contacts — return null (not empty string) for missing primaryEmail

Release prep:
- Add README.md, CONTRIBUTING.md, LICENSE (MIT)
- Add .github/workflows/release.yml — builds XPI + Linux binary on v* tags
- Remove .mcp.json from tracking (gitignore; example now in README)
- Remove TESTING.md and docs/plans/ (internal notes)
- Update ROADMAP.md, CLAUDE.md, docs/system_instructions.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>