chore: initial scaffolding for SynthesisAgent.OpenclawPlugin

OpenClaw plugin that manages long-lived interactive Claude Code processes
per OpenClaw session. Process manager + session-mapping persistence +
bridge WebSocket server skeleton.

Will be rewritten to follow the contractor-agent HTTP model-provider pattern
(register as `synthesis-claude-bridge` provider, receive /v1/chat/completions,
dispatch to channel notification on the bound Claude process). See parent
repo's STATUS.md for the punch list.

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "synthesis-agent-openclaw-plugin",
+  "version": "0.0.1",
+  "license": "Apache-2.0",
+  "description": "OpenClaw plugin: manages long-lived Claude Code processes per OpenClaw session for SynthesisAgent",
+  "type": "module",
+  "main": "index.ts",
+  "dependencies": {
+    "ws": "^8.18.0"
+  },
+  "devDependencies": {
+    "@types/ws": "^8.5.10",
+    "typescript": "^5.0.0",
+    "openclaw": "*"
+  }
+}