chore: Update issue tracker and documentation

- Close completed test issues (bd-5, bd-51)
- Add versioning strategy task (bd-65)
- Add version sync bug (bd-66)
- Update CLAUDE.md to reflect MCP server implementation status

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -181,7 +181,7 @@ Run `bd stats` to see overall progress.
 - **Core CLI**: Mature, but always room for polish
 - **Examples**: Growing collection of agent integrations
 - **Documentation**: Comprehensive but can always improve
-- **MCP Server**: Planned (see bd-5)
+- **MCP Server**: Implemented at `integrations/beads-mcp/` with Claude Code plugin
 - **Migration Tools**: Planned (see bd-6)
 
 ### 1.0 Milestone