merge: incorporate origin/main into community-mode branch

Conflicts resolved:
- CHANGELOG.md: both sides added [0.13.0.0] entries — bumped our
  community-mode entry to [0.14.0.0], kept main's design tools
  entry as [0.13.0.0] below it
- VERSION + package.json: bumped to 0.14.0.0 to sit above main's 0.13.0.0

Main brought in: design binary ($D) with 13 commands, /design-shotgun
skill, comparison board, design memory, visual diffing, gallery timeline,
screenshot evolution, responsive variants, design-to-code prompts.

Also fixed: zsh glob safety in design-shotgun/SKILL.md.tmpl (added
setopt +o nomatch guard to ls variant-*.png).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -1,6 +1,7 @@
 .env
 node_modules/
 browse/dist/
+design/dist/
 bin/gstack-global-discover
 .gstack/
 .claude/skills/