fix(system): reject boolean timeit arguments

[belowzeroff]

What changes for users

.sys.timeit true and .sys.timeit false now return a type error instead of silently toggling the profiler. Numeric integer arguments and strict numeric strings keep their existing behavior.

Why

Boolean values are distinct from integer values in Rayfall and should not be accepted by the integer argument parser used by .sys.timeit and .sys.listen.

Validation

• Targeted rfl/system/syscmd_coverage: 1/1 passed
• Full test suite: 3928/3928 passed
• Release build with -Werror: passed
• Based on fresh origin/dev (d13bde4c)

[singaraiona]

No, the should be accepted by design.

[belowzeroff]

The current dev branch intentionally keeps boolean .sys.timeit arguments supported, so this change is obsolete and has no remaining patch to carry. Closing this PR.