# NEXT11 V6.33 R5 — ATG front-foot rise anchor + fixed camera height + Reverse rise-lock audit

## Base authority
Apply this delta on top of **V6.33 R4**, reconstructed from:

1. `NEXT11_V6_32_DYNAMIC_WARMUP_18_OF_18_BUGFIXES_LOCKED_FULL_ROOT_LIBRARY_READY.zip`
2. `NEXT11_V6_33_R2_ATOMIC_TRANSITION_STABLE_LUNGES_ROOT_WRAP_WIP_DELTA_FROM_V6_32.zip`
3. `NEXT11_V6_33_R3_HURDLE_CAMERA_REVERSE_ENTRY90_WIP_DELTA_FROM_V6_33_R2.zip`
4. `NEXT11_V6_33_R4_HURDLE_STRUCTURAL_HEAD_STABLE_WIP_DELTA_FROM_V6_33_R3.zip`

R4 Hurdle work remains untouched.

## User-requested R5 scope

### ATG Split Squat Lunge
The movement itself is retained. The lead/front foot is now locked in display/world space during the rise so Nex actually stands up over the planted front leg while the outer travel continues. The correction is isolated to the planted leg chain and fades only after foot release.

Measured maximum lead-foot display/world drift during rise: **0.000031 mm**. Maximum solve residual: **0.000090 mm**.

New resolved authority:
`assets/nexprod/resolved/atg-split-squat-lunges-v633-r5-front-foot-rise-world-anchor.resolved.json`

### Reverse Lunge
Audit showed the stepping/rear foot was already physically anchored through the rise in the R2 resolved authority. Maximum measured display/world Z drift: **0.00000545 mm**. Therefore the existing Reverse leg solution is kept byte-for-byte rather than rewriting a good motion. The apparent instability was dominated by camera reframing.

### Camera
Vertical camera authority is now fixed:
- parent pass-player stores a fixed camera Y and fixed look-at Y from the initial product framing
- camera up-vector is forced to `(0,1,0)`
- horizontal X/Z tracking remains active
- child `fitCamera()` exits when `__NEXT_PASSPLAYER_EXTERNAL_CAMERA_AUTHORITY === true`, preventing per-pose bbox refits from making the world bob with Nex

## QA
- ATG actual Nex CPU-skinned two-view motion QA: **PASS**
- ATG rise display/world foot-anchor numeric audit: **PASS**
- Reverse rear-foot rise-lock numeric audit: **PASS**
- Camera vertical-authority source audit: **PASS**
- JS syntax + changed/new JSON parse checks: **PASS**
- Real `preview.html` browser/passplayer QA: **not run in this execution environment because browser navigation is blocked by policy**. Final visual approval remains pending on the normal preview/player path.

QA video:
`qa/V6_33_R5_ATG_FRONT_FOOT_RISE_CPU_QA.mp4`

## Delta policy
This is a WIP delta checkpoint, not a new fullroot. No source MOVs, model assets, or unrelated QA are duplicated.