fix(container): remove devcontainer-file from CONTAINER_RESOURCE_TYPES

devcontainer-file is a read-only config file resource, not a running
container. Including it in CONTAINER_RESOURCE_TYPES causes
validate_container_available() to return True when only a config file
is linked, even though no actual container is available.

Closes #10598

features/execution_environment.feature

@@ -131,7 +131,7 @@ Feature: Execution environment routing
     Given I import CONTAINER_RESOURCE_TYPES
     Then it should contain "container-instance"
     And it should contain "devcontainer-instance"
-    And it should contain "devcontainer-file"
+    And it should not contain "devcontainer-file"
     And it should not contain "git-checkout"
 
   # ── ContainerUnavailableError ───────────────────────────────────────

robot/helper_execution_environment.py

@@ -81,7 +81,7 @@ def _run_resource_types() -> None:
     """Verify container resource types."""
     assert "container-instance" in CONTAINER_RESOURCE_TYPES
     assert "devcontainer-instance" in CONTAINER_RESOURCE_TYPES
-    assert "devcontainer-file" in CONTAINER_RESOURCE_TYPES
+    assert "devcontainer-file" not in CONTAINER_RESOURCE_TYPES
     assert "git-checkout" not in CONTAINER_RESOURCE_TYPES
     print("resource-types-ok")
 

src/cleveragents/application/services/execution_environment_resolver.py

@@ -55,7 +55,6 @@ CONTAINER_RESOURCE_TYPES: frozenset[str] = frozenset(
     {
         "container-instance",
         "devcontainer-instance",
-        "devcontainer-file",
     }
 )