Ship shared 1024-2048 high cell (V2); sync docs + model

Promote shared 16-512 weight soup

model: force cuDNN determinism and fail fast on incomplete artifact

Pin determinism flags in load() (eligibility insurance)

v2: collapse 64-512 cells into one shared carry-aware TCN weight-set

Tier 10 = 0.94: highest_tier 9->10 (MAX), overall 0.886->0.978

Tier 9 = 0.99: highest_tier 8->9, overall 0.788->0.886

64-bit cell: MLP -> carry-aware TCN (fixes tier-0 near-2^64, 944MB->13MB)

Tier 8 saturated at 0.92: highest_tier 7->8, overall 0.769->0.788

Partial 512-bit cell (tier 8 = 0.73): overall 0.698 -> 0.769

Tier-7 256-bit carry-aware TCN cell: highest_tier 6->7, overall 0.602->0.698, tier-7 0.98

Tier-6 carry-aware TCN cell: highest_tier 5->6, overall 0.531->0.602, tier-6 0.97

Horner-RNN modular-multiplication model (tiers 1-5, up to 2^64)