Implements support for --no- prefix negation on boolean and flag DU fields
when marked with [<ArgumentNegateWithPrefix>]. This allows both --flag and
--no-flag forms to be accepted, with --no- variants negating the value.
Changes:
- Extend ArgParserGenerator to generate --no- prefix handling
- Add conflict detection for overlapping --no- prefixed arguments
- Update help text to display both forms (e.g., --verbose / --no-verbose)
- Add test examples in ArgParserNegationTests.fs demonstrating:
- Boolean field negation
- Flag DU negation
- Multiple ArgumentLongForm with negation
- Combined features (defaults, help text)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
