Verification

Actual verification results live in docs/VALIDATION.md; targeted remediation records are in SAFETY_FIXES.md and MODELING_FIXES.md.

Test layers

Layer	Command	Notes
Unit/archive/loader/integration	npm test	Includes independent Three.js loader acceptance of exports
Coverage	npm run test:coverage	—
End-to-end regression	npm run test:browser	Starts its own Vite server on port 4176, launches headless Chromium with software WebGL flags
Focused regressions	test:layout, test:safety, test:modeling, test:png, test:erase-hud, test:theme, test:font	Layout checks, safety/validation audit, modeling flows, PNG integrity, erase gestures + FPS HUD, theming, bundled font

Reports and captures are written to test-results/ (with docs/*-report.json copies). No external websites are contacted by the tests.

Stability evidence

• A 10,000-tile smoke/stability check passed; no 30-FPS hardware guarantee is made.
• GLB and OBJ/MTL/PNG ZIP exports are independently tested through standard Three.js loaders.
• Shared bounded PNG CRC/zlib/scanline validation and actual-dimension checks run across import, projects, recovery and export — see PNG_VALIDATION.md.

Platform

Chromium is validated; Firefox/Safari need a manual QA pass. Regression scripts run headless Chromium with software WebGL flags.

Embedded contexts

The embedded preview may have different download or storage restrictions than a normal deployed app. The source app makes no runtime network requests.