comptime integers part 2#422
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…romInteger Integer literals now have type `comptime integer` rather than `word`. `tcLit`/`typeOfTcExp` return `integer`; `isNumericTy` accepts it; a `markIntegerComptime` post-pass forces `ct=True` on any let binding of integer type. `Cond` propagates its expected type into both branches so literals in if/then/else infer correctly. Integer literal patterns adopt the scrutinee's numeric type in `tcPat`. A primitive `Int` class (instances `word` and `integer`) is introduced; `Int.fromInteger` is also accessible to user code. The specializer resolves `Int.fromInteger` to `wordFromInteger` or identity by result type. std gains `integer` instances for Eq/Ord/Add/Sub/Mul. Call sites that relied on bare literals defaulting to `word` now carry explicit `: word` annotations. Assisted-By: Claude Opus 4.8 <noreply@anthropic.com>
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This is the second part of comptime integer implementation: literals are of type integer; desugaring adds
Int.fromInteger