feat: add official Codex skill and harden task execution

Install and update artemis-use with task diagnostics and plugin guidance. Preserve cross-device file receipts, review canonical reports, guard stage transitions and reduce small history summaries. Improve exploration lifecycle, request recovery and browser live connections.

docs/plugins.md

@@ -76,7 +76,7 @@ SDK：先 `await agent.init(execution_target="computer")`，然后 `agent.new_ta
 
 ```json
 {
-  "schema_version": 1,
+  "schema_version": 2,
   "id": "lab-control",
   "name": "实验室控制",
   "version": "1.0.0",
@@ -92,7 +92,14 @@ SDK：先 `await agent.init(execution_target="computer")`，然后 `agent.new_ta
   },
   "skill": "SKILL.md",
   "config": {"token": {"label": "连接密钥", "secret": true, "required": true}},
-  "resources": ["router:lab"]
+  "resources": ["router:lab"],
+  "capabilities": {
+    "kind": "api", "recording": "none", "required_tools": ["read_status"],
+    "tools": {"read_status": {
+      "effect": "read", "observation": false, "idempotent": true,
+      "cancellation": "confirmed", "evidence": ["state", "text"]
+    }}
+  }
 }
 ```