Decompose checker.py into checker/ package (C8a)#117
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Split the 2,043-line monolith into 8 focused modules using mixin-based composition. TypeChecker inherits from six mixins (resolution, modules, registration, expressions, calls, control) that each handle a specific type-checking concern. Public API (typecheck()) is unchanged; zero test modifications. Closes #99 Co-Authored-By: Claude <noreply@anthropic.invalid>
Co-Authored-By: Claude <noreply@anthropic.invalid>
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Summary
checker.pymonolith into achecker/package with 8 focused modules using mixin-based compositioncore.py(349) — TypeChecker class, orchestration, diagnostics, contractsresolution.py(190) — AST TypeExpr to semantic Type, type inferencemodules.py(153) — cross-module registration (C7b/C7c)registration.py(138) — Pass 1 forward declarationsexpressions.py(530) — expression synthesis, operators, statementscalls.py(390) — function, constructor, and module-qualified callscontrol.py(439) — if/match, patterns, exhaustiveness, effect handlerstypecheck()) unchanged; zero test modificationsCloses #99
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