chore: Bump version to 0.41.0

Update version across all components:
- cmd/bd/version.go
- .claude-plugin/plugin.json, marketplace.json
- npm-package/package.json
- integrations/beads-mcp/pyproject.toml
- Git hook templates

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

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

cmd/bd/templates/hooks/post-merge

@@ -1,6 +1,6 @@
 #!/bin/sh
 # bd-shim v1
-# bd-hooks-version: 0.40.0
+# bd-hooks-version: 0.41.0
 #
 # bd (beads) post-merge hook - thin shim
 #