📝(openspec) add field-variant-classic change artifacts

- Add proposal, design, specs and tasks documentation
- Add verification report
- Archive completed change

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -36,3 +36,7 @@ ghpages-output
 # Project ignore files
 packages/react/chromatic.config.json
 packages/tokens/src/lib/cunningham.ts
+
+# Claude Code
+CLAUDE.md
+.claude*