Files
sx/tests/expected
agra 94335f94d7 ERR/E4.2: truncate integer main's return to u8 for the JIT exit code
A non-failable integer `main :: () -> T` must exit with its return value
truncated to u8 (matching C main / the OS exit-status byte), so `sx run`
(JIT) and an AOT binary agree. runJITMain clamped instead: any value outside
0..255 returned exit 1, so `return 1105` exited 1 (not 81), `return -1` exited
1 (not 255), and `return 256` exited 1 (not 0).

Fix: bit-cast the i32 return to u32 and @truncate to u8 — negatives wrap as
their two's-complement low byte rather than being clamped. The AOT path
already gets OS truncation, so it was already correct; this makes JIT match.

examples/238-main-exit-truncation.sx returns 1105 -> exit 81. Values <=255
(42, 200) still pass through unchanged.

Gates: zig build, zig build test, bash tests/run_examples.sh (275 passed; the
lone failure is the user's uncommitted 213-canonical-map pack WIP).
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