e44ba4b240
Follow-up #2 from step 2b: pack-fns with a generic return type (`(..\$args) -> \$R`). Today's `monomorphizePackFn` calls `resolveReturnType` which sees `\$R` as a generic name and returns an opaque struct TypeId. The mono's ret_ty is wrong and the value silently coerces to 0. `examples/159-pack-generic-ret.sx` pins this: `first(42)` and `first(99)` both return `0` instead of the call arg. The lock-in captures the wrong output as the snapshot to flip. Next commit infers the ret type from the body's tail expression (arrow form) or the first explicit `return X;` (block form), then builds the mono signature against that concrete type. 198/198 example tests + \`zig build test\` green.
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