Revert "chore(cli): drop two unused runtime shadow imports"

The two names are reached through this module by the coordination-shadow
command tests, which seed and read the shadow via the command surface, so
removing the imports broke four of them. Restore the imports with a note so
the seam is not mistaken for dead code again.

Signed-off-by: wchwawa <wch19961116@gmail.com>

Author: wchwawa

loopx/cli_commands/coordination_shadow.py

@@ -6,10 +6,15 @@
 from collections.abc import Callable
 from pathlib import Path
 
-from ..control_plane.coordination.runtime_shadow import (
+# The projection builder and lease loader are reached through this module by
+# tests that seed and read the shadow through the command surface; keep them
+# importable here even when the command does not call them directly.
+from ..control_plane.coordination.runtime_shadow import (  # noqa: F401
     bootstrap_coordination_runtime_shadow,
     build_runtime_shadow_source_snapshot,
+    build_todo_runtime_shadow_projection,
     inspect_coordination_runtime_shadow,
+    load_task_lease_runtime_shadow_records,
     qualify_coordination_runtime_shadow,
     read_coordination_runtime_shadow_todo_candidate,
     resolve_coordination_runtime_shadow_config,