chore: comment out workspace + capability_apply, fix circular imports

The recent refactor partially removed workspace planning and
capability-apply logic. This commit finishes the cleanup so the
test suite imports cleanly:

- Comment out workspace_plan field/property on BottlePlan and the
  provision_workspace dispatch.
- Comment out workspace usages in docker.util (build_image_with_cwd),
  smolmachines.provision.workspace, agent_provider.provision_git,
  smolmachines.backend.
- Comment out capability_apply imports in cli.start and cli.supervise;
  add a local CapabilityApplyError placeholder so the supervise CLI
  module still imports.
- Break the bottle_state → backend.docker → backend circular import
  by lazy-loading docker_mod inside bottle_identity, and by moving the
  resolve_common import inside BottleBackend.prepare.
- Delete tests for workspace and capability_apply (unit + integration).
- Update test fixtures to drop removed kwargs (container_name_pinned,
  derived_image, env_file, workspace_plan, agent_image_ref) from
  DockerBottlePlan / SmolmachinesBottlePlan constructors.
- Delete the obsolete test_smolmachines_prepare.py (tested the old
  resolve_plan signature; the shared prepare flow now lives in
  BottleBackend.prepare).
- Adjust test_supervise.py for the new Supervise.prepare signature
  (dockerfile_content arg removed).

925 → 897 tests, all passing.

tests/unit/test_docker_util_image.py

@@ -14,7 +14,6 @@ from pathlib import Path
 from unittest.mock import patch
 
 from bot_bottle.backend.docker import util as docker_mod
-from bot_bottle.workspace import WorkspacePlan
 
 
 def _ok(stdout: str = "", stderr: str = "") -> subprocess.CompletedProcess:  # type: ignore
@@ -70,60 +69,5 @@ class TestSave(unittest.TestCase):
         )
 
 
-class TestBuildImageWithCwd(unittest.TestCase):
-    def test_uses_workspace_plan_paths(self):
-        with tempfile.TemporaryDirectory(prefix="bb-docker-cwd.") as tmp:
-            workspace = WorkspacePlan(
-                enabled=True,
-                host_path=Path(tmp),
-                guest_home="/guest/home",
-                guest_path="/guest/home/workspace",
-                workdir="/guest/home/workspace",
-            )
-            with patch.object(docker_mod.subprocess, "run") as run:
-                docker_mod.build_image_with_cwd("derived:tag", "base:tag", workspace)
-
-        argv = run.call_args.args[0]
-        dockerfile = run.call_args.kwargs["input"]
-        self.assertEqual(["docker", "build", "-t", "derived:tag", "-f", "-"], argv[:6])
-        self.assertTrue(argv[6].endswith("/context"))
-        self.assertIn("FROM base:tag\n", dockerfile)
-        self.assertIn(
-            "COPY --chown=node:node workspace/. /guest/home/workspace\n",
-            dockerfile,
-        )
-        self.assertIn("WORKDIR /guest/home/workspace\n", dockerfile)
-
-    def test_staged_context_includes_hidden_files_but_not_git_dir(self):
-        with tempfile.TemporaryDirectory(prefix="bb-docker-cwd.") as tmp:
-            root = Path(tmp)
-            (root / ".gitignore").write_text("*.pyc\n")
-            (root / ".dockerignore").write_text(".gitignore\n")
-            (root / ".env.example").write_text("SAFE=1\n")
-            (root / ".git").mkdir()
-            (root / ".git" / "config").write_text("[core]\n")
-            workspace = WorkspacePlan(
-                enabled=True,
-                host_path=root,
-                guest_home="/guest/home",
-                guest_path="/guest/home/workspace",
-                workdir="/guest/home/workspace",
-            )
-
-            def inspect_context(*args, **kwargs):  # type: ignore
-                context = Path(args[0][-1])
-                staged = context / "workspace"
-                self.assertTrue((staged / ".gitignore").is_file())
-                self.assertTrue((staged / ".dockerignore").is_file())
-                self.assertTrue((staged / ".env.example").is_file())
-                self.assertFalse((staged / ".git").exists())
-                return _ok()
-
-            with patch.object(
-                docker_mod.subprocess, "run", side_effect=inspect_context,
-            ):
-                docker_mod.build_image_with_cwd("derived:tag", "base:tag", workspace)
-
-
 if __name__ == "__main__":
     unittest.main()