test(e2e): live-verify the migrated i2v edge cases left as debt in v0.69.0 #686

The v0.69.0 live-verification ledger records these as debt — no external blocker, simply not run. Filed so they are accountable rather than parked (AGENTS.md § The Iron Law).

From docs/LIVE_VERIFICATION_v0.69.0.md:

• --duration on a model whose pane renders the duration row (Omni 1.1 Flash) in the Frames submode
• A start frame larger than a few hundred KB — maseQ inlines the file and the upload leg has a 60 s budget
• A JPEG with EXIF (the labs 400 class)
• Portrait 9:16
• --count > 1
• End frame / UUID / @Name frames: these exit 36 by design and the refusal never reaches Flow, so the residual risk is the detail string drifting, not the behaviour — cheap to assert

All are $0 to cheap on the migrated host. tests/e2e/test_migrated_i2v_e2e.py is the home for them.

Refs #639.