Refactor monolithic core.py into focused modules and add response caching#1

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JunjieAraoXiong wants to merge 2 commits intoT3S1AMAX:mainfrom

JunjieAraoXiong:refactor/modular-core-and-caching

Commits on Apr 4, 2026

Refactor monolithic core.py into focused modules and add response caching
JunjieAraoXiong
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Address review feedback: atomic cache writes, public constants, deduplicate EVAL_GRADES
JunjieAraoXiong
committed