Addresses the review's two remaining code warnings and the three suggestions:
- Log ledgers (host and child) start one byte below the budget, reserving the
serialized outer-array envelope (two brackets and n-1 commas over n entries'
separators); the exact-zero test moves to maxLogBytes 104 and a new exact-limit
case pins that maxLogBytes 5 admits ['a'] (5 bytes) while 4 truncates to the
marker alone.
- die_if_cpu_exhausted unblocks SIGXCPU (pthread_sigmask SIG_UNBLOCK, captured at
import, None-guarded for Windows) before re-delivering it, so a program that
masks SIGXCPU, burns past the soft limit, and returns is still classified as a
timeout; a regression test pins the masked path.
- ast.parse passes filename="<model>" so parse-time syntax diagnostics carry the
same source label as compile and runtime tracebacks; the syntax-error test
asserts the label.
- The NUL-escape test comments use the true six-byte JSON escape \u0000 instead
of the caret notation; the README Known Limitations (en + zh) records that
PID-reuse protection is inert on macOS; a combined-rebind regression test pins
BaseException plus the traceback reporter rebinding together.
4e0d77c1d6