feat(archive): complete recorded session lifecycle

tests/test_session_preparation.py

@@ -433,3 +433,38 @@ def test_launch_reservation_blocks_eviction_until_lease_expires(tmp_path: Path)
         assert not first_recording.path.exists()
     finally:
         manager.close()
+
+
+def test_first_recording_get_pin_consumes_launch_reservation(tmp_path: Path) -> None:
+    command = _command(tmp_path / "session")
+
+    def exporter(source: Path, destination: Path) -> dict[str, object]:
+        return _summary(source, destination, b"recording")
+
+    materializer = SessionRecordingMaterializer(
+        tmp_path / "private",
+        exporter=exporter,
+        free_space_reserve_bytes=0,
+    )
+    manager = SessionRecordingPreparationManager(materializer)
+    try:
+        materializer.materialize(command)
+        resolved = manager.resolve_cached(command)
+        assert resolved is not None and resolved.state == "ready"
+        reserved = manager.reserve_cached(command, lease_seconds=60.0)
+        assert reserved is not None
+
+        pinned = manager.pin_ready(
+            command.session_id,
+            preparation_id=reserved.preparation_id,
+        )
+
+        assert pinned is not None
+        _, release_response = pinned
+        assert manager.release_launch_reservation(command.session_id) is False
+        assert materializer.delete_cached(command.session_id) is False
+
+        release_response()
+        assert materializer.delete_cached(command.session_id) is True
+    finally:
+        manager.close()