move pi-mono into companion-cloud as apps/companion-os

- Copy all pi-mono source into apps/companion-os/
- Update Dockerfile to COPY pre-built binary instead of downloading from GitHub Releases
- Update deploy-staging.yml to build pi from source (bun compile) before Docker build
- Add apps/companion-os/** to path triggers
- No more cross-repo dispatch needed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/pi-channels/package.json

@@ -0,0 +1,40 @@
+{
+  "name": "@e9n/pi-channels",
+  "version": "0.1.0",
+  "description": "Two-way channel extension for pi — route messages between agents and Telegram, webhooks, and custom adapters",
+  "type": "module",
+  "keywords": [
+    "pi-package"
+  ],
+  "license": "MIT",
+  "author": "Espen Nilsen <hi@e9n.dev>",
+  "pi": {
+    "extensions": [
+      "./src/index.ts"
+    ]
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "typescript": "^5.0.0"
+  },
+  "peerDependencies": {
+    "@mariozechner/pi-ai": "*",
+    "@mariozechner/pi-coding-agent": "*",
+    "@sinclair/typebox": "*"
+  },
+  "dependencies": {
+    "@slack/socket-mode": "^2.0.5",
+    "@slack/web-api": "^7.14.1"
+  },
+  "files": [
+    "CHANGELOG.md",
+    "README.md",
+    "package.json",
+    "src"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/espennilsen/pi.git",
+    "directory": "extensions/pi-channels"
+  }
+}