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Export hangs/freezes with AI tracking enabled (lookahead/replay; low-VRAM cards) #446

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@mohamedtahaguelzim

Multiple field reports of exports freezing on 0.5.2/0.5.3-beta.2. Two mechanisms identified:

(a) Deterministic hang: reco stitch L R -c cal.json -o out.mp4 --model yolo.onnx --allow-no-tracking --lookahead 1.5 --replay r.mkv on v0.5.3-beta.2 hangs after decoder init, before any frame renders (Linux, NVDEC).

(b) VRAM exhaustion on 6GB cards with 4K sources: the lookahead pool (~1.8GB at 3840x2160) plus the D3D11VA staging pool (142 NV12 slots, ~1.8GB) consume nearly all free VRAM before the encoder starts. #378/#381/#382 (merged, unreleased at the time of the reports) target this; retest after the next release.

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