[POC V1] T7.1 Add adapter integration test against a mock OpenClaw endpoint

[fcarucci]

Imported from docs/milestones/proof-of-concept-1/poc_v1_task_breakdown.md.

Phase: P7 End-To-End Proof

Source task: T7.1

---

Purpose:

• prove the OpenClaw adapter works against realistic payloads

Output:

• integration test server with canned OpenClaw responses

Tests:

• integration test: gateway health fetch
• integration test: agents list fetch
• integration test: bindings fetch
• integration test: sessions fetch
• integration test: optional local metadata hint loading
• integration test: gateway data still renders when local metadata files are absent

---