agent: Implemented the explicit persisted webhook state machine.

tests/test_opencode_abort.py

@@ -0,0 +1,34 @@
+from pathlib import Path
+
+import httpx
+import pytest
+
+from agentci.adapters.opencode import OpenCodeClient, OpenCodeError
+
+
+def client(tmp_path: Path, status: int) -> OpenCodeClient:
+    return OpenCodeClient(
+        base_url="http://opencode:4096",
+        username="opencode",
+        password="secret",
+        schemas_dir=tmp_path,
+        health_directory=tmp_path,
+        required_models=(),
+        timeout_seconds=60,
+        transport=httpx.MockTransport(lambda _request: httpx.Response(status)),
+    )
+
+
+@pytest.mark.parametrize("status", [200, 204, 404, 409])
+async def test_absent_or_inactive_session_is_success(tmp_path: Path, status: int) -> None:
+    value = client(tmp_path, status)
+    await value.abort("session", tmp_path)
+    await value.close()
+
+
+@pytest.mark.parametrize("status", [400, 429, 500])
+async def test_abort_failure_is_visible_for_retry(tmp_path: Path, status: int) -> None:
+    value = client(tmp_path, status)
+    with pytest.raises(OpenCodeError):
+        await value.abort("session", tmp_path)
+    await value.close()