Build the Wait debug line only at DEBUG, and skip objects the state lacks

[yichao-liang]

option_policy_to_policy built _format_wait_target_debug's string on Wait step 1 and every 25 steps whenever an abstract function was wired, even with DEBUG logging off.
The formatter read every target object's features from the state.
Process planning injects ground-truth helper objects (the Fan grid's loc_* cells) only into the planning task and re-derives them inside its abstract function, so the executed state lacks them.
The Fan process-planning oracle on the historical arena (HISTORICAL_ARENA_FLAGS) therefore crashed at its first Wait with KeyError: loc_0.7900_1.6840:loc from State.get.

The wrapper now builds the line only when the root logger is enabled for DEBUG.
The formatter lists a target object the state does not contain as not in state and skips its features, so a debug message can no longer end an episode.

Test plan

• Two regression tests in tests/test_wait_option_backstop.py run a Wait whose target atom names an object absent from the state.
  With DEBUG on, the debug line reports the object as not in state; below DEBUG, the line is never built.
  On master the first fails with the same KeyError and the second with the stub's AssertionError.
• Fan process-planning oracle on the historical arena with the issue's command (seed 0, one test task, --timeout 60).
  This branch solves the task: SwitchOn, four Waits that end on their target atoms, SwitchOff.
  Planning alone takes 58-67 s on the cluster's nodes, so at 60 s it timed out on two of three nodes (once on master, in skeleton search; once on this branch, in refinement).
• The same command with --timeout 400, so that planning always finishes.
  Master finds the same 6-step plan and crashes at the first Wait with the KeyError.
  This branch solves the task in all three runs, one of them with --debug, where all 7 Wait debug lines list the two loc_* cells as not in state.
• yapf, isort 5.10.1, docformatter, mypy and pylint on the whole tree.
• The 8 pytest shards.

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