fix(release): update missed version files to 0.43.0

The 0.43.0 release bump missed several files that should have been
updated by scripts/bump-version.sh:
- npm-package/package.json
- integrations/beads-mcp/pyproject.toml
- integrations/beads-mcp/src/beads_mcp/__init__.py
- .claude-plugin/plugin.json
- .claude-plugin/marketplace.json
- cmd/bd/templates/hooks/*

This caused the NPM publish to fail (could not publish 0.42.0 over itself).

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

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

Executed-By: beads/crew/dave
Rig: beads
Role: crew

integrations/beads-mcp/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "beads-mcp"
-version = "0.42.0"
+version = "0.43.0"
 description = "MCP server for beads issue tracker."
 readme = "README.md"
 requires-python = ">=3.10"

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__ = "0.42.0"
+__version__ = "0.43.0"