fix(package): add repository + homepage + bugs metadata

npm publish --provenance requires `repository.url` to match the GitHub
Actions workflow's repo. The release.yml workflow's first fire failed with
E422 because package.json had no repository field.

Adopts the rig-bridge canonical shape:
- repository.type: "git"
- repository.url: "git+https://github.com/mcp-tool-shop-org/ai-loadout.git"
- homepage: landing page
- bugs.url: issues URL

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mcp-tool-shop

package.json

@@ -44,6 +44,14 @@
   ],
   "author": "mcp-tool-shop",
   "license": "MIT",
+  "homepage": "https://mcp-tool-shop-org.github.io/ai-loadout/",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/mcp-tool-shop-org/ai-loadout.git"
+  },
+  "bugs": {
+    "url": "https://github.com/mcp-tool-shop-org/ai-loadout/issues"
+  },
   "engines": {
     "node": ">=20"
   },