fix: harden iccSpecSepToTiff CLI args

[xsscx]

PR Summary

Resolved iccSpecSepToTiff CLI Parsing #1603

2026-06-29 13:55:51 UTC

1. compress and sep were documented as boolean (0 | 1), but code uses atoi(argv[2]) != 0 and atoi(argv[3]) != 0.
2. Missing or unreadable optional profile was silently ignored
3. Extra trailing arguments was ignored
4. Ranges that do not land exactly on end were silently truncated

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• Code style matches nearby code: 2-space indent, K&R braces, m_ members

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