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Prio C: Wan2.2-Video-Timeout Diagnose + erster #17-Clip (2026-07-23)

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# Prio C: Wan2.2-Video-Timeout #17 (2026-07-23)
## Diagnose: LANGSAM, kein Haenger (nvidia-smi belegt)
Fastpath-Repro 512x896 Lightning-4step 49 Frames = Gesamt ~255s (~4,3min):
- Load ~0-80s: VRAM 18,8->28,6GB (2x10GB A14B-GGUF von M:), util niedrig. FIXE Kosten.
- Sampling ~80-125s (~45s): util-Peak 75%, ~0,9s/Frame (4-Step Two-Expert).
- Wan-VAE-Decode ~131-220s (~90s): VRAM springt auf 37GB, util 7-30%. FIXE Kosten.
- util nie 100% (GGUF-Q5 memory-bound). Load+VAE-Decode fix, unabhaengig von Steps.
## Rootcause #17
main_v3_portal.py build_wan_workflow() = Vollpfad 20-Step @ W=720, per-Segment timeout_s=1500 (Zeile 928). 20 Steps = 5x Sampling on top der fixen Kosten. HD-Schaetzung 20-Step @ 1440x2560 ~43min/Clip -> sprengt 1500s.
## Erster #17-Beleg (Master-Gate PASSED, selbst geprueft)
B:\comfyui-output\christina_wan_fast_00002.mp4: h264 512x896 16fps 3,06s 49 Frames. Ganzkoerper Christina, blaues Kleid+Brille, fotoreal, keine Deformierung. Bewegung bestaetigt (md5-Diff, Pixeldiff YAVG 14,75). Kein Ton = korrekt. Kette Wan2.2 end-to-end sauber. Matrix-Post: BAER-OK ausstehend.
## [BAER-DEC] Ziel #17
(A) Fastpath 512x896 Lightning-4step: ~4,3min/Clip, bewiesen, top Iteration, sub-HD.
(B) Lightning-4step @ HD 1440x2560: ~19min/Clip (Schaetzung).
(C) Voll 20-Step @ HD: ~43min/Clip, unpraktikabel fuer Iteration, Timeout ~2700s+.
Empfehlung: (A) Default zum Ketten-Aufbau, (B)/(C) nur final. Umbau nach Baer-Wahl.