chore(release): bump version to 0.48.0

Release highlights:
- VersionedStorage interface for pluggable backends
- bd types command and enhancement type alias
- bd close -m flag (git commit convention)
- RepoContext API for centralized git operations
- Dolt backend improvements (WIP)
- Many bug fixes for doctor, sync, hooks, worktrees

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

claude-plugin/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "beads",
   "description": "AI-supervised issue tracker for coding workflows. Manage tasks, discover work, and maintain context with simple CLI commands.",
-  "version": "0.47.2",
+  "version": "0.48.0",
   "author": {
     "name": "Steve Yegge",
     "url": "https://github.com/steveyegge"