Add --no- prefix for bools (#455)

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>

WoofWare.Myriad.Plugins/version.json

@@ -1,5 +1,5 @@
 {
-  "version": "9.0",
+  "version": "9.1",
   "publicReleaseRefSpec": [
     "^refs/heads/main$"
   ],