feat(registry): Gitea npm registry publish config + Changesets

- .npmrc: @mosaic scope points to Gitea registry
- Changesets initialized with initial minor release
- publishConfig added to all packages
- Woodpecker publish step on main branch

plugins/openclaw-context/package.json

@@ -2,7 +2,7 @@
   "name": "@mosaic/openclaw-context",
   "version": "0.1.0",
   "type": "module",
-  "description": "OpenClaw \u2192 OpenBrain context engine plugin",
+  "description": "OpenClaw → OpenBrain context engine plugin",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
   "exports": {
@@ -34,5 +34,9 @@
     "openbrain",
     "context-engine",
     "plugin"
-  ]
-}
+  ],
+  "publishConfig": {
+    "registry": "https://git.mosaicstack.dev/api/packages/mosaic/npm",
+    "access": "public"
+  }
+}