feat: add deterministic vgpu overlays

[0thernet]

Summary

• checksum-lock vgpu 0.3.1 and add a fifth deterministic HTML-overlay scaffold for explicit WGSL/WebGPU effects
• enable Atet-owned WebGPU launch flags only for declared vgpu overlays, preserving the integrity-bound SwiftShader path and exact signed Chrome snapshot modes
• document the authoring contract in Atet's README and canonical Agent Skill, with source, security, semantic-pixel, temporal-change, and repeat-digest coverage

Verification

• bun run check
• bun run check:skill
• ATET_RUN_HTML_OVERLAY_LIBRARY_SMOKE=1 bun test ./apps/desktop/cli/html-overlay-renderer.macos.test.ts -t "renders every approved animated scaffold through its exact browser module"

The real-Chrome smoke verified the exact vgpu bundle, transparent semantic pixels, distinct absolute-time frames, and byte-identical repeat-render digests.

[vercel]

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Project	Deployment	Actions	Updated
atet	Ready	Preview	Sep 1, 2026 8:26pm UTC