feat: implement MCP proxy for OpenClaw tool access in contractor agent

Complete the MCP tool call chain:
- contractor-agent bridge exposes /mcp/execute endpoint for tool callbacks
- openclaw-mcp-server.mjs proxies OpenClaw tool defs to Claude as MCP tools
- sdk-adapter passes --mcp-config on first turn with all OpenClaw tools
- tool-test plugin registers contractor_echo in globalThis tool handler map
- agent-config-writer auto-sets tools.profile=full so OpenClaw sends tool defs
- Fix --mcp-config arg ordering: prompt must come before <configs...> flag

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "contractor-agent",
+  "version": "0.1.0",
+  "description": "OpenClaw plugin: turns Claude Code into an OpenClaw-managed contractor agent",
+  "type": "module",
+  "main": "src/index.ts",
+  "scripts": {
+    "check": "tsc --noEmit",
+    "install-plugin": "node scripts/install.mjs --install",
+    "uninstall-plugin": "node scripts/install.mjs --uninstall"
+  },
+  "dependencies": {
+    "@anthropic-ai/claude-agent-sdk": "^0.2.101"
+  },
+  "devDependencies": {
+    "typescript": "^5.0.0",
+    "openclaw": "*"
+  }
+}