chore: Bump version to 0.30.6

Updated all component versions:
- bd CLI: 0.30.5 → 0.30.6
- Plugin: 0.30.5 → 0.30.6
- MCP server: 0.30.5 → 0.30.6
- npm package: 0.30.5 → 0.30.6

Changes in this release:
- bd graph command shows dependency counts using subgraph formatting (bd-6v2)
- types.StatusPinned for persistent beads that survive cleanup

cmd/bd/templates/hooks/pre-commit

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.30.5
+# bd-hooks-version: 0.30.6
 #
 # bd (beads) pre-commit hook
 #