feat(isometric): downscale droid workers before WASM load

[h0lybyte]

Summary

• Adds inline script to the isometric game Astro page that calls window.kbve.downscale() before WASM pthreads load
• Polls for window.kbve availability (max ~5s, 100ms interval) since droid may initialize after the page script runs
• Gracefully handles cases where droid isn't present (timeout, no error)
• No changes to the isometric game code itself — only the Astro wrapper

Test plan

• Verify isometric game still loads and runs correctly
• Check browser console for [Isometric] Droid downscale failed — should not appear
• Confirm droid canvas worker is terminated before WASM init (check window.kbve.scaleLevel() returns 'minimal')

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None