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).
kv_alloc guards every KVState free with if(k->Lc) precisely so it can be
called again on the same KVState (context resize, slot re-init). Exercise
that path: allocate, touch the cache, allocate again at a larger size.
Fails at this commit with a double-free (fixed in the next commit):
malloc: *** error for object 0x7: pointer being freed was not allocated
ZacharyZcR