chore: Bump version to 0.46.0

Updated all component versions:
- bd CLI: 0.45.0 → 0.46.0
- Plugin: 0.45.0 → 0.46.0
- MCP server: 0.45.0 → 0.46.0
- npm package: 0.45.0 → 0.46.0
- Documentation: 0.45.0 → 0.46.0

Changes in 0.46.0:
- Custom type support in beads config.yaml (bd-649s)
- Gas Town types extraction into beads core (bd-i54l)
- Gate workflow discovery improvements (bd-m8ew)

cmd/bd/version.go

@@ -14,7 +14,7 @@ import (
 
 var (
 	// Version is the current version of bd (overridden by ldflags at build time)
-    Version = "0.45.0"
+    Version = "0.46.0"
 	// Build can be set via ldflags at compile time
 	Build = "dev"
 	// Commit and branch the git revision the binary was built from (optional ldflag)