feat: complete HomeAgent architecture v2

- IO abstraction layer with OutputChannel routing and capability validation
- Three-layer memory (Context-Document-Graph) with TF-IDF relevance pruning
- OneBot V11 QQ protocol plugin with Reverse WebSocket client
- Plugin system with hot-reload (SKILL.md + native factories)
- Knowledge system with TF-IDF vector indexing
- Personality system (personal.md)
- Text memory (JSONL with rotation)
- Change tracker (overlayfs) with rollback
- Lua adapter VM
- Design document (DESIGN.md)

Module: gitcode.com/JianFeeeee/HomeAgent

plugins/qq/skill.json

@@ -0,0 +1,13 @@
+{
+  "name": "qq",
+  "description": "QQ 通道插件，通过 OneBot 标准协议与 QQ 前端协同工作",
+  "version": "1.0.0",
+  "author": "HomeAgent",
+  "entry": "ws://127.0.0.1:6700",
+  "io": {
+    "type": "io",
+    "input_route": "qq",
+    "output_route": "qq",
+    "output_caps": ["text", "file", "image"]
+  }
+}