fix(cli): return usage errors with exit code 2 - #24
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Classify parser failures separately from runtime failures so unknown flags and missing option values use the documented usage-error exit code.
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What this PR does
Before this PR:
Unknown flags and missing option values were treated as runtime failures and exited with code 1.
After this PR:
CLI parser failures return the documented usage-error code 2, with regression coverage for unknown flags and missing option values.
Type of change
Bug fix
Breaking changes (if any)
None.