chore: Bump version to 0.9.4

Updated all component versions:
- bd CLI: 0.9.3 → 0.9.4
- Plugin: 0.9.3 → 0.9.4
- MCP server: 0.9.3 → 0.9.4
- Documentation: 0.9.3 → 0.9.4

Generated by scripts/bump-version.sh

.claude-plugin/marketplace.json

@@ -9,7 +9,7 @@
       "name": "beads",
       "source": "./",
       "description": "AI-supervised issue tracker for coding workflows",
-      "version": "0.9.3"
+      "version": "0.9.4"
     }
   ]
 }

.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": "0.9.3",
+  "version": "0.9.4",
   "author": {
     "name": "Steve Yegge",
     "url": "https://github.com/steveyegge"