chore: Bump version to 0.21.6

Updated all component versions:
- bd CLI: 0.21.5 → 0.21.6
- Plugin: 0.21.5 → 0.21.6
- MCP server: 0.21.5 → 0.21.6
- Documentation: 0.21.5 → 0.21.6

Generated by scripts/bump-version.sh

integrations/beads-mcp/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "beads-mcp"
-version = "0.21.5"
+version = "0.21.6"
 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__ = "0.21.5"
+__version__ = "0.21.6"