Task: Bring ores.diff to the clean standard

ores.diff passes the Component Clean Standard for a component of kind Entity.

• Every checklist item that applies to a component of kind Entity passes, with its evidence recorded on the task.
• Every item that does not apply is recorded as not applicable, with the reason.
• Every generator defect found is fixed at its source, with a regression test.
• ores.diff is listed in COMPONENTS_UNDER_TEST, and check_component_drift.py --all passes.

Work the Component Clean Standard in its section order, one entity at a time, and record each item's result in the table below.

1. Baseline and inventory (B01 to B05). Record the baseline before any edit.
2. Models (M01 to M10).
3. Protocol (P01 to P06).
4. Generation (G01 to G06).
5. Wiring and data (W01 to W04).
6. Shell (S01, S02).
7. Structure and hygiene (H01 to H03).
8. Verification (V01 to V06), ending with the registry entry.

Manual QA scenarios (scaffolded via compass add test_scenario) that verify this task. Link new ones here as they're created; the scenario doc itself links back via its "Verifies task" field.