feat(FN-2347): add experimental OpenClaw runtime plugin scaffold

- Add fusion-plugin-openclaw-runtime workspace package with manifest, runtime metadata, and deferred placeholder factory
- Add unit tests for OpenClaw plugin behavior and PluginRunner runtime discovery compatibility
- Document OpenClaw runtime installation and runtimeHint usage in README, getting-started, and settings reference docs
- Include built dist artifacts for the new plugin and update workspace/lockfile entries

plugins/fusion-plugin-openclaw-runtime/src/index.ts

@@ -0,0 +1,73 @@
+/**
+ * OpenClaw Runtime Plugin
+ *
+ * Registers an experimental OpenClaw runtime with Fusion's plugin runtime
+ * discovery pipeline. Runtime execution behavior is intentionally deferred.
+ */
+
+import { definePlugin } from "@fusion/plugin-sdk";
+import type {
+  FusionPlugin,
+  PluginContext,
+  PluginRuntimeFactory,
+  PluginRuntimeManifestMetadata,
+} from "@fusion/plugin-sdk";
+
+const OPENCLAW_RUNTIME_ID = "openclaw";
+const OPENCLAW_RUNTIME_VERSION = "0.1.0";
+
+const openclawRuntimeMetadata: PluginRuntimeManifestMetadata = {
+  runtimeId: OPENCLAW_RUNTIME_ID,
+  name: "OpenClaw Runtime",
+  description: "Experimental OpenClaw runtime integration for Fusion tasks (execution deferred)",
+  version: OPENCLAW_RUNTIME_VERSION,
+};
+
+const openclawRuntimeFactory: PluginRuntimeFactory = (_ctx: PluginContext) => {
+  return {
+    runtimeId: OPENCLAW_RUNTIME_ID,
+    version: OPENCLAW_RUNTIME_VERSION,
+    status: "deferred",
+    message:
+      "OpenClaw runtime execution is currently deferred. This runtime is registered for discovery and configuration only.",
+    execute: async () => {
+      throw new Error(
+        "OpenClaw runtime is not implemented yet. Runtime discovery and configuration are supported, but execution is deferred.",
+      );
+    },
+  };
+};
+
+const plugin: FusionPlugin = definePlugin({
+  manifest: {
+    id: "fusion-plugin-openclaw-runtime",
+    name: "OpenClaw Runtime Plugin",
+    version: "0.1.0",
+    description: "OpenClaw runtime plugin for Fusion with experimental deferred execution",
+    author: "Fusion Team",
+    homepage: "https://github.com/gsxdsm/fusion",
+    runtime: openclawRuntimeMetadata,
+  },
+  state: "installed",
+  hooks: {
+    onLoad: (ctx) => {
+      ctx.logger.info("OpenClaw Runtime Plugin loaded (experimental placeholder runtime)");
+      ctx.emitEvent("openclaw-runtime:loaded", {
+        runtimeId: OPENCLAW_RUNTIME_ID,
+        version: OPENCLAW_RUNTIME_VERSION,
+        status: "deferred",
+      });
+    },
+    onUnload: () => {
+      // No context available during unload
+    },
+  },
+  runtime: {
+    metadata: openclawRuntimeMetadata,
+    factory: openclawRuntimeFactory,
+  },
+});
+
+export default plugin;
+
+export { openclawRuntimeMetadata, openclawRuntimeFactory, OPENCLAW_RUNTIME_ID };