fix: smoke-test agent images after build, add start --no-cache

npm treats optionalDependencies failures as non-fatal, so a transient
network blip fetching claude-code's platform-native binary during
`npm install -g` left a stub CLI in an image that still "built"
successfully — then got baked into the Docker/Container layer cache
until forced to rebuild. Post-build smoke test (provider-declared
argv, run in a throwaway container of the freshly built image) fails
the launch loudly instead of shipping a broken image; --no-cache
gives an escape hatch to force a from-scratch rebuild.

Closes #353.

tests/unit/test_docker_launch_committed_image.py

@@ -88,9 +88,11 @@ class TestLaunchCommittedImage(unittest.TestCase):
             del ctx, dockerfile
             built.append(image)
 
+<<<<<<< HEAD
         with mock.patch.object(launch_mod, "read_committed_image", return_value=committed_tag), \
                 mock.patch.object(launch_mod.docker_mod, "image_exists", return_value=image_present), \
                 mock.patch.object(launch_mod.docker_mod, "build_image", side_effect=_build), \
+                mock.patch.object(launch_mod.docker_mod, "verify_agent_image"), \
                 mock.patch.object(launch_mod, "launch_consolidated", return_value=_CTX), \
                 mock.patch.object(launch_mod, "teardown_consolidated"), \
                 mock.patch.object(launch_mod, "DockerGateway", return_value=gw), \

tests/unit/test_docker_launch_teardown.py

@@ -94,6 +94,7 @@ class TestTeardownWarning(unittest.TestCase):
         )
 
         with mock.patch.object(launch_mod.docker_mod, "build_image"), \
+             mock.patch.object(launch_mod.docker_mod, "verify_agent_image"), \
              mock.patch.object(launch_mod, "launch_consolidated", return_value=ctx), \
              mock.patch.object(launch_mod, "teardown_consolidated"), \
              mock.patch.object(launch_mod, "DockerGateway", return_value=gw), \

tests/unit/test_macos_container_launch.py

@@ -357,12 +357,17 @@ class TestMacosContainerLaunchCommittedImage(unittest.TestCase):
             launch.container_mod, "image_exists", return_value=False,
         ), patch.object(
             launch.container_mod, "build_image", side_effect=fake_build,
-        ):
+        ), patch.object(
+            launch.container_mod, "verify_agent_image",
+        ) as verify:
             updated = launch._build_images(plan)
 
         self.assertEqual("bot-bottle-agent:latest", updated.image)
         self.assertEqual(2, len(calls))
         self.assertEqual("bot-bottle-agent:latest", calls[1][0])
+        verify.assert_called_once_with(
+            "bot-bottle-agent:latest", ("claude", "--version"),
+        )
 
 
 if __name__ == "__main__":