fix: Update remaining version files to 0.30.3

Files missed in manual version bump:
- .claude-plugin/plugin.json
- .claude-plugin/marketplace.json
- integrations/beads-mcp/pyproject.toml
- integrations/beads-mcp/__init__.py
- Hook templates

Generated with Claude Code

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

.claude-plugin/marketplace.json

@@ -9,7 +9,7 @@
       "name": "beads",
       "source": "./",
       "description": "AI-supervised issue tracker for coding workflows",
-      "version": "0.30.2"
+      "version": "0.30.3"
     }
   ]
 }

.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": "0.30.2",
+  "version": "0.30.3",
   "author": {
     "name": "Steve Yegge",
     "url": "https://github.com/steveyegge"