feat: modernize toolchain, refactor core, add tiered CI and opt-in quantization
Modernizes ComfyUI-CoreMLSuite onto Python 3.12 / torch 2.7 / coremltools 9
with a characterization-test safety net. The default conversion path is
unchanged; existing saved workflows produce identical output.
- Toolchain bump (Python 3.12, torch 2.7, coremltools 9, numpy <2) with the
blocking upstream pins overridden.
- Framework-free logic moved into coreml_suite/core/ (no comfy/coremltools
imports); old module paths re-export from there.
- Opt-in quantize_nbits dropdown (none|8|6|4) for k-means weight
palettization; default none is byte-for-byte identical to before.
- Tiered CI: Tier 0 (Linux unit), Tier 1 (macOS-ARM smoke), Tier 2
(self-hosted Apple Silicon golden-image check on the ANE).
aszc
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