Task: Bind ores.synthetic entities to profiles; verify zero-diff regen

Survey every ores.synthetic entity against the profile catalogue, rebind matches, regenerate, and require zero additional diff against the pre-rebind checked-in output.

• Every entity discovered via the synthetic catalogue entry is surveyed against all Variability Profiles.
• Every matching entity is rebound and regenerated with zero additional diff versus its pre-rebind checked-in output.
• No-match entities are recorded with their actual feature values, not silently dropped.
• Any pre-existing drift the regen+diff surfaces is fixed, not worked around. See the related capture on fx_spot_generation_config's system-tenant fallback SQL codegen drift, and resolve it here if it falls within this catalogue entry's scope.
• Full local build and ctest green after regeneration.

(Implementation strategy. Written when work starts; key decisions are distilled into the parent story's * Decisions at close, but the plan itself stays — it is the historical record of what we did.)

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