chore: tidy package manifest and docs (drop .pi artifact in history)

package.json

@@ -1,8 +1,13 @@
 {
   "name": "pi-subagents",
   "version": "0.1.0",
+  "description": "Pi extension package that runs subagent tasks in separate child sessions and ships the prompts and wrapper code needed to execute those runs.",
   "type": "module",
   "keywords": ["pi-package"],
+  "repository": {
+    "type": "git",
+    "url": "https://gitea.rwiesner.com/pi/pi-subagents"
+  },
   "scripts": {
     "test": "tsx --test src/*.test.ts src/**/*.test.ts"
   },