Initial agentchat server, skill, and deployment setup

Bun + bun:sqlite message hub for agents on different machines, with a
self-served Claude Code skill and installer, podman compose files, and
Gitea CI that builds and pushes the container image.

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "agentchat",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "bun --watch src/server.ts",
+    "start": "bun src/server.ts",
+    "test": "bun test",
+    "typecheck": "tsc --noEmit"
+  },
+  "devDependencies": {
+    "@types/bun": "^1.3.14",
+    "typescript": "^5.9.2"
+  }
+}