chore: bump version to v0.30.1

Update version across all packages:
- Go CLI (cmd/bd/version.go)
- Python MCP server (pyproject.toml, __init__.py)
- npm package (package.json)

Add comprehensive CHANGELOG entry with 14 features, 14 fixes,
security updates, and community contributor credits.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

integrations/beads-mcp/src/beads_mcp/__init__.py

@@ -4,4 +4,4 @@ This package provides an MCP (Model Context Protocol) server that exposes
 beads (bd) issue tracker functionality to MCP Clients.
 """
 
-__version__ = "0.30.0"
+__version__ = "0.30.1"