# PAWBench A-09 ratio-control candidate-video staging (Issue #298)

Collaborator-writable staging surface for the A-09 model-level ratio-control
case study ([PhysEdit#293](https://github.com/Andrew0613/PhysEdit/issues/293),
execution issue [#298](https://github.com/Andrew0613/PhysEdit/issues/298)).
This repo realizes the `candidate_data` location proposed by
`staging_locations.json` in the #297 input package; it lives under the
`PhysEdit` org (public) by operator decision of 2026-07-13 because the proposed
`Andrew613` repos were never created and private quota was unavailable.

## What this repository contains

- `candidate_videos/` — Seedance 2.0 first/last-frame candidate training
  videos for scene A-09, named by frozen `sample_id`. The formal denominator
  is exactly 200 rows (40 endpoint controls x 5 seed identities). Videos
  appear here as soon as they are generated, **before** any usability
  filtering, per the #298 upload-before-exclusion contract.
- `manifests/candidate_ledger.jsonl` — one terminal-status row per planned
  sample (schema: `candidate_ledger.schema.json` from the #297 package),
  updated at each phase boundary.
- `receipts/` — phase receipts, launch authorization (with live price quote,
  provider schema deviations, and the fal-storage input-transport fallback),
  and the hash-bound fal staging map.
- `review/` — canary visual-review contact sheet and motion strips.

## What this repository is NOT

- These are **candidate training-data videos**, not PAWBench benchmark
  inputs, not accepted training data (acceptance is a separate reviewed
  gate), not model outputs under evaluation, and not evidence that any
  training approach achieves probabilistic alignment.
- No usability decision is implied by a video's presence here. The accepted
  bank and failure manifests are separate, later artifacts.
- No PAWEval result, checkpoint, metric, or paper-facing claim lives here.

## Provenance

- Input authority: `Andrew613/PAWBench-A09-LastFrames` @
  `800521f1cc6332cd834632a1ecdecb81b17937e4` (normalized A-09 first frame,
  40 terminal-frame controls, frozen 200-row generation plan, frozen
  Seedance 2.0 request profile).
- Generator: fal.ai `bytedance/seedance-2.0/image-to-video`, standard tier,
  720p, 5 s, `aspect_ratio=auto`, audio disabled, direction-neutral frozen
  prompt. The provider exposes no seed parameter; planned seed identities
  are sample identities (provider-returned seeds are recorded in the run
  sidecar).
- Runner: `projects/pawbench/tools/a09_ratio_control/run_seedance_candidate_grid.py`
  on branch `task/pawbench/0298_seedance_bank` of PhysEdit.
- Every video is hash-bound to its plan row (first-frame hash, endpoint
  hash, prompt hash, request-profile hash) in the candidate ledger;
  `SHA256SUMS` covers the uploaded files.

No credentials or secrets are stored here; receipts record credential
environment variable names only.