feat(firecracker): enumerate running bottles

tests/unit/test_firecracker_enumerate.py

@@ -0,0 +1,64 @@
+"""Unit tests for Firecracker active-agent enumeration."""
+
+from __future__ import annotations
+
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from bot_bottle.backend import EnumerationError
+from bot_bottle.backend.firecracker import enumerate as fc_enumerate
+from bot_bottle.bottle_state import BottleMetadata
+
+
+class TestEnumerateActive(unittest.TestCase):
+    def test_maps_live_run_dirs_to_active_agents(self) -> None:
+        metadata = BottleMetadata(
+            identity="dev-a",
+            agent_name="claude",
+            cwd="",
+            copy_cwd=False,
+            started_at="2026-07-26T12:00:00Z",
+            label="review",
+            color="blue",
+        )
+        with (
+            patch.object(
+                fc_enumerate, "live_run_dirs",
+                return_value=(Path("/cache/run/dev-a"),),
+            ),
+            patch.object(fc_enumerate, "read_metadata", return_value=metadata),
+        ):
+            agents = fc_enumerate.enumerate_active()
+        self.assertEqual(1, len(agents))
+        self.assertEqual("firecracker", agents[0].backend_name)
+        self.assertEqual("dev-a", agents[0].slug)
+        self.assertEqual("claude", agents[0].agent_name)
+        self.assertEqual("review", agents[0].label)
+        self.assertEqual((), agents[0].services)
+
+    def test_missing_metadata_uses_safe_defaults(self) -> None:
+        with (
+            patch.object(
+                fc_enumerate, "live_run_dirs",
+                return_value=(Path("/cache/run/dev-a"),),
+            ),
+            patch.object(fc_enumerate, "read_metadata", return_value=None),
+        ):
+            agent = fc_enumerate.enumerate_active()[0]
+        self.assertEqual("?", agent.agent_name)
+        self.assertEqual("", agent.started_at)
+
+    def test_process_scan_failure_propagates(self) -> None:
+        with (
+            patch.object(
+                fc_enumerate, "live_run_dirs",
+                side_effect=EnumerationError("pgrep failed"),
+            ),
+            self.assertRaisesRegex(EnumerationError, "pgrep failed"),
+        ):
+            fc_enumerate.enumerate_active()
+
+
+if __name__ == "__main__":
+    unittest.main()