add Tab2 live A/B vs Bonsai (sequential: Bonsai first, then POCKET); 2nd llama-server for Bonsai Q1_0; README=BONSAI vs POCKET

use prebuilt llama.cpp release b10091 (qwen35moe, runtime CPU dispatch) - no compile (no OOM), no -march=native (no SIGILL)

fix: cap compile parallelism (-j2) to avoid OOMKilled (exit137) during llama.cpp build

rebuild backend on upstream llama.cpp master (qwen35moe support) via llama-server; FastAPI proxies; portable CPU build

fix: portable CPU build (no -march=native/AVX512) -> stop SIGILL exit132; graceful load-error status

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