chore: Bump version to 0.21.3

Updated all component versions:
- bd CLI: 0.21.2 → 0.21.3
- Plugin: 0.21.2 → 0.21.3
- MCP server: 0.21.2 → 0.21.3
- Documentation: 0.21.2 → 0.21.3

integrations/beads-mcp/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "beads-mcp"
-version = "0.21.2"
+version = "0.21.3"
 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__ = "0.21.2"
+__version__ = "0.21.3"