gitignore: ignore local-only skill dirs at directory level

Upstream only listed the vercel/claude-hud/find-skills/web-design files
individually, so newly added files under those dirs still showed up as
untracked. Ignore the whole directory for every skill that does not
exist upstream.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -359,5 +359,15 @@ __pycache__/
 # --- local-only skills (not synced to skills-win) ---
 /BMSv4_pincfg/
 /cubemx-min-prj/
+/claude-hud-statusline/
+/deploy-to-vercel/
+/find-skills/
+/vercel-cli-with-tokens/
+/vercel-composition-patterns/
+/vercel-optimize/
+/vercel-react-best-practices/
+/vercel-react-native-skills/
+/vercel-react-view-transitions/
+/web-design-guidelines/
 /.stfolder/
 /.claude/