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/version.go

@@ -14,7 +14,7 @@ import (
 
 var (
 	// Version is the current version of bd (overridden by ldflags at build time)
-	Version = "0.30.5"
+	Version = "0.30.6"
 	// Build can be set via ldflags at compile time
 	Build = "dev"
 	// Commit and branch the git revision the binary was built from (optional ldflag)