feat(editor): capture matched presentation evidence

[chubes4]

Summary

• derive expected generated presentation identities independently from filtered editor settings
• capture idle-canvas modal state and matched frontend/editor/diff screenshots
• fail closed unless widths, geometry, readability, visibility, and asset resolution all pass

This provides the authoritative editor evidence required by Automattic/static-site-importer#1357.

Verification

• npx tsc -p packages/runtime-playground --noEmit
• npm run test:editor-actions
• npx tsx --test tests/browser-routed-command-security.test.ts

AI Assistance

OpenCode with OpenAI openai/gpt-5.6-sol was used to inspect the editor evidence contracts, implement the provider and tests, and verify focused checks; Chris Huber orchestrated and reviewed the work.