Fix 354 gdlint warnings across 65 files: 194 class-definitions-order (reorder declarations), 138 max-line-length (split long lines), 22 code issues (unused args, no-else-return, naming). Update .gdlintrc to exclude addons/ and raise max-public-methods for test files. No logic changes — declaration order, whitespace, and naming only. Ticket: #783 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>