speed-uplisted

# speed-up Final retime of a finished short. Runs AFTER `end-card` and BEFORE `qc-clip` so the QC gate and `visual-cadence` measure (and `save-local` saves) the actual delivered, sped-up clip. ```bash speed-up.sh <in.mp4> <out.mp4> [speed=1.25] ``` - `speed` — playback multiplier; `1.25` ships ~20% faster. Read from arg 3 or the `SPEED` env (default `1.25`). - Video is retimed with `setpts=PTS/SPEED`; audio with `atempo` (chained into 0.5–2.0 stages for out-of-range speeds) so pitch is preserved. - Because it is a single uniform retime applied last, ALL upstream relative timing is preserved — nothing else in the pipeline needs to know about it. Note the cold-open title hold (`TITLE_SWAP`) is set pre-speed, so its on-screen time is `TITLE_SWAP / SPEED`. - Deterministic (no Claude), idempotent (`.spmeta` mtime+param signature), non-fatal (probe/ffmpeg failure → passthrough copy). - `SPEED=1` or `SPEED_UP=0` → passthrough.