Two behavior-preserving simplifications:
* plan_subtasks_memory.run_episode: the task_aug 'axes' and free-form
branches built identical deduped rows via copy-pasted seen/append
loops. Collapse to one branch that picks the variant source, then a
shared _task_aug_rows() helper does the dedup + row build (-~25 LOC).
* writer: _normalize_persistent_row / _normalize_event_row shared the
same camera-validate + struct construction. Extract _normalize_row(),
keeping the exact key order (the parquet struct schema is inferred
from insertion order, so timestamp must stay between style and camera).
docs: 'Which modules run' is now a table giving each module's on/off flag
(--plan.enabled / --interjections.enabled / --vqa.enabled) and what it
turns off.
Verified: 40 tests pass (incl. test_writer struct round-trip); pre-commit clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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