refactor: split glm.c into colibri.c + 4 header modules
Rename glm.c → colibri.c and extract four self-contained modules into header-only files (same pattern as st.h/tier.h/grammar.h): quant.h (672 lines) — SIMD matmul kernels, quantization sample.h (143 lines) — RNG, top-p sampling, stop-set kv_persist.h (121 lines) — .coli_kv disk persistence telemetry.h (189 lines) — dashboard protocol, stats, usage Main engine file shrinks from 6588 to 5396 lines (−18%). Build system: primary target is now colibri$(EXE); `make glm` remains as a phony alias for backward compat. CI, setup.sh, coli CLI, and all 10 test files that include the engine are updated. make check passes (C + Python, 73 tests, zero warnings).
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