v0.7.0 — Premium motion engine + mechanized caption timing & screen cleanup

The biggest visual-quality jump in the kit so far — v0.6.0 fixed the sound, this one fixes the picture.

Highlights

• src/longform_maker/fx_lib.py — premium-motion engine: sub-pixel float Ken Burns (the anti-zoompan, zero integer jitter), double-layer additive bloom (4px+16px), 45° light sweep, full easing library (ease_out_expo/smootherstep/…), stagger scheduler, per-frame film grain + vignette, and a fully synthesized SFX kit (whoosh/pop/tick/riser/hit — no audio assets needed). Real self-test.
• word_captions.py (M105) — captions from whisper word-timestamps: auto line-break at real pauses, mishear fixes before line-breaking, master-timeline (speed-aware) conversion, optional one-keyword-per-line emphasis. Never hand-guess long-segment splits again (they drift 2-3s).
• screen_clean.py (M104) — screen recordings are default-toxic: enforced head+tail trim (recorder UI lives at both ends), chrome crop, blur-pad, and blur_boxes targeted blurs for center-frame UI text cropping can't save.
• 4 new mechanical QA gates in delivery_qa: caption-sync spot-check, full-frame contact sheets (edge strips can't see center-frame floaters), scene-pacing 3-band audit (7s/15s/30s), dead-air detection (freeze∩silence).
• knowledge/premium-motion-fx.md — the whole wave-1/2/3 plan with exact parameters, plus a 10-item deliberately-skipped list.
• R15-R25 in knowledge/youtube-algorithm-2026.md — 2026 mechanics: Test & Compare judges watch-time-per-impression, auto-dubbing, Shorts decoupling, seed-impression day-0 playbook, the 30s-retention gate, Hype globalization, and more.
• examples/03_premium_fx.py — see the whole stack in a 3s output video, zero real media.

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