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)

npm-package/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@beads/bd",
-  "version": "0.45.0",
+  "version": "0.46.0",
   "description": "Beads issue tracker - lightweight memory system for coding agents with native binary support",
   "main": "bin/bd.js",
   "bin": {