chore: update .gitignore, add singularity-run base path, remove stray files

- Add .vite/, .claude/, .plan.md, .playwright-mcp/, test-*.png to .gitignore
- Add gh-pages base path to singularity-run vite config
- Remove stray test screenshots, debug script, vite cache

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -5,3 +5,16 @@ _site/
 *.log
 test-results/
 playwright-report/
+
+# Vite cache
+.vite/
+
+# Test screenshots (stray)
+test-*.png
+
+# Claude Code
+.claude/
+.plan.md
+
+# Playwright MCP
+.playwright-mcp/

examples/singularity-run/vite.config.js

@@ -1,6 +1,7 @@
 import { defineConfig } from 'vite';
 
 export default defineConfig({
+  base: '/game-creator/singularity-run/',
   server: {
     port: 3000,
   },