- gfx_sp_vertex probe (env GE_D75V=lo-hi): logs per G_VTX batch the
transformed x/y/z/w min/max, raw first-vertex ob, dest_index, and the
MP translation row. Proves the logo transform is correct and that every
batch encodes v0=0 (slot-overwrite hypothesis).
- videoGetFrameCount() accessor for frame-gated probes.
- findings.md: M-195 entry in the D75 section (emission + transform
eliminated; G_VTX v0=0 overwrite is the leading suspect).
- GE-ENV-PROBES.md: register GE_D75V, bump reconciled line.