Tags: kasapdev/java-cli-arg-parser

Add CHANGELOG entry for v1.2.0 subcommand support

Add edge-case tests for unregistered names, null defaults, alias coll…

…isions, and short-flag/-option validation

Adds 6 new regression tests: flag()/option() on unregistered names,
null default value resolution, duplicate short alias rejection, short
flag inline-value rejection, short-alias option missing-value rejection,
and lone '-' token handling. All existing and new tests pass; no bugs
were found.

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