docs: PR#679 listening samples (same text+seed across gpu/ane/ane-state placements)

feat(v2.1/english): pocket_state multifunction MLState package (write_state/prefill/generate over shared KV state; mobius Trial 23). Loaded by FluidAudio PocketTtsModelPlacement.aneState (macOS 15+/iOS 18+); Swift-measured -14.9% e2e vs .ane, WER 0.

feat(v2.1): ANE-eligible flowlm_step_ane + cond_prefill_ane for all 9 remaining language packs (german/italian/portuguese/spanish 6L + french/german/italian/portuguese/spanish 24L). Rank-4 split-KV, scatter-free, explicit output names, no NaN-BOS protocol (mobius Trials 19/20). flowlm 100% ANE on every pack incl. 24L (1830 ops). Loaded by FluidAudio PocketTtsModelPlacement.ane.

feat(v2.1/english): ANE-eligible flowlm_step_ane + cond_prefill_ane (rank-4 split-KV, scatter-free; mobius Trials 19/20). flowlm 100% ANE / cond_prefill 92% under cpuAndNeuralEngine; bit-identical math to the rank-5 graphs; explicit output names; no NaN-BOS protocol (host passes the BOS latent directly). Loaded by FluidAudio PocketTtsModelPlacement.ane.

Add v2.1 english (optimized: fused decoder ANE + cond prefill + fp16 flowlm; same weights as v2) (#3)

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