feat(plugins): add managed runtime SDK and release 2.4.5

examples/plugins/managed-tool-demo/plugin.json

@@ -0,0 +1,23 @@
+{
+  "schema_version": 2,
+  "id": "managed-tool-demo",
+  "name": "受管工具与文件快照示例",
+  "version": "1.0.0",
+  "description": "开发模板：读取已批准的任务文件快照，调用固定校验程序并保存真实回执。",
+  "artemis_version": ">=2.4.5,<3.0.0",
+  "platforms": ["win32", "linux", "darwin"],
+  "architectures": ["amd64", "arm64"],
+  "license": "Apache-2.0",
+  "server": {"command": "${config.python}", "args": ["-B", "${plugin_dir}/server.py"]},
+  "config": {"python": {"label": "当前 ARTEMIS 环境的 Python", "default": "python"}},
+  "skill": "SKILL.md",
+  "targets": ["android", "mixed", "computer"],
+  "resources": [],
+  "capabilities": {
+    "kind": "file", "recording": "none", "required_tools": ["verify_note"],
+    "tools": {"verify_note": {
+      "effect": "read", "observation": false, "idempotent": false,
+      "cancellation": "confirmed", "evidence": ["text", "file"]
+    }}
+  }
+}