docs: add API quick reference to openclaw skill guide

SKILL.md

@@ -31,3 +31,61 @@ Agents can use ScreenJob to launch and control GUI workflows, including orchestr
 1. Submit job via CLI or API.
 2. Agent performs tool loop.
 3. Read final `response.return` and `response.data` from job status.
+
+## API Quick Reference
+
+Base URL:
+
+- `http://127.0.0.1:8787` (default)
+
+Auth (required on all `/api/*` routes):
+
+- `Authorization: Bearer <SCREENJOB_TOKEN>`
+- or `X-ScreenJob-Token: <SCREENJOB_TOKEN>`
+
+Create a job:
+
+- `POST /api/jobs`
+- Body:
+
+```json
+{
+  "job": "Open amazon.de and go to my orders",
+  "model": "gpt-5.4-mini",
+  "disabled_tools": [],
+  "safety_override": false
+}
+```
+
+- Response:
+
+```json
+{ "job_id": "job_..." }
+```
+
+Check progress/result:
+
+- `GET /api/jobs/{job_id}`
+- `GET /api/jobs/{job_id}/status`
+- `GET /api/jobs/{job_id}/events`
+- `GET /api/jobs`
+- `POST /api/jobs/{job_id}/cancel`
+- `GET /api/stats`
+
+Result contract in job payload:
+
+```json
+{
+  "status": "completed",
+  "response": {
+    "return": "Task completed successfully",
+    "data": "file1.txt\nfile2.txt"
+  },
+  "return": "Task completed successfully",
+  "data": "file1.txt\nfile2.txt"
+}
+```
+
+Artifacts (screenshots/enhanced images):
+
+- `GET /api/jobs/{job_id}/artifact?path=<absolute_artifact_path>&token=<SCREENJOB_TOKEN>`