fix(run): require decimal max values

[aiirvizionz]

Summary

• require moshcode run --max values to use decimal integer text
• reject alternate Number() forms such as 1e1 and 0x2 instead of silently accepting them
• keep normal decimal --max values working

Test

• node --test --test-name-pattern "run rejects non-decimal max values|run accepts equals-form max option" test/run-options.test.mjs

Note: the full test/run-options.test.mjs file still has an existing Windows-only shell expansion failure in the nested MOSHCODE_NESTED test, unrelated to this parser change.