Tirith flags .app domains with a lookalike_tld finding because the TLD
"can be confused with file extensions". This is a false positive for
legitimate production APIs (e.g. api.example.app, lark.app).
Add _is_app_tld_finding() and a post-parse suppression block in
check_command_security(): if the only finding(s) on a warn verdict are
lookalike_tld entries for .app, downgrade the action to allow.
Mixed findings (e.g. .app + shortened_url) and block verdicts are
unaffected. Non-.app lookalike_tld findings (.zip, .exe, etc.) are
preserved.
Add 15 regression tests covering: .app-only suppression, mixed-finding
preservation, non-.app TLD preservation, block-verdict invariance, and
the helper's field-name and case-insensitivity behaviour.
Closes#24461
Wesley Simplicio
fae0fa4325