ASSET NAMING AND MANIFEST
Video: bottle_C01_E01_H02_9x16_15s_v01.mp4
Static: bottle_C02_E01_H01_4x5_static_v01.jpg
C = concept; E = execution; H = opening; v = production revision.
Do not overwrite a live version with a different asset.
Use a separate test ID; one asset can participate in more than one test.

Manifest fields:
asset_id, filename, concept_id, execution_id, hook_id, version,
format, duration_seconds, placement, promise, proof_source,
cta, destination, hypothesis, test_id, creator, approved_at