# NEXT11 V423C R4 — Toe Walk — APPROVED

## Baseline
- Locked baseline: `NEXT11_V422_RECOVERED_MERGED_FULL_ROOT_LIBRARY_READY.zip`
- Baseline SHA-256: `eb5830b3ab5f5ff204e62da2976d566bb00c420f885a90d673f02f20183758b6`
- This package is an isolated delta from V422. Do not treat it as a new shared full-root baseline.

## Approval
- Exercise: Toe walk / tågång
- Iteration: `V423C_R4`
- State: `APPROVED` by user on 2026-09-08.
- Final QA: `diagnostics/v423c_toe_walk_source_timed/V423C_R4_TOE_WALK_SOURCE_FOOT_PITCH_TWO_REP_QA.mp4`

## Final motion contract
- Ordinary traveling human gait on toe/forefoot support.
- Forefoot/toes are the support contact; heel remains visibly elevated through stance.
- Support forefoot is world-locked while pelvis/root travels through the step.
- Knee bend-plane remains anatomically consistent.
- Loop travel is continuous; no root teleport at repetition boundary.
- Swing foot stays plantarflexed/downward through the cycle to match the supplied source.
- No exercise-specific solver was introduced.

## Video chain
Priority is:
1. `assets/media/exercises/toe-walk/toe-walk.mp4`
2. Source-of-truth MOV: `assets/media/exercises/toe-walk/source/NEXT11_dynamic_warmup_ijj7TD0DA6Q_toe-walk.MOV`
3. YouTube fallback `ijj7TD0DA6Q`

## Verified final metrics
- Build report: PASS
- Support forefoot world-lock range: L = 0 m, R = 0 m
- Cycle travel Z: 0.498567 m
- Cycle duration: 1.2 s
- Knee-plane target audit: PASS
- True toe support: PASS
- Toe visual audit: PASS
- Minimum support heel clearance: 0.094956 m
- Final two-rep QA: 1280×720, 24 fps, ~2.417 s

## Important
R1–R3 candidates and failed/intermediate QA assets are intentionally excluded from this checkpoint. The active/final resolved asset is:
`assets/nexprod/resolved/toe-walk-v423c-r4-source-foot-pitch.resolved.json`