V29 Gate 9: Terminal UX Quality And Browser Proof

[geraldarthurdavis]

Gate closure

• Specifies the V29 Gate 9 Terminal UX quality and browser-proof canon across the V29 spec family and Terminal README.
• Adds a maintained Gate 9 checker and wires it into root scripts and gate-quality CI.
• Adds the Terminal UX browser-proof contract, accessible Terminal landmarks, skip navigation, explicit loading/error/empty state semantics, and selected-activity detail controls.
• Adds focused Jest coverage and a Terminal Playwright browser proof for landmarks, route-owned detail, blocked console posture, and responsive overflow behavior.

Validation

• pnpm run check:v29-gate9
• pnpm --dir uapi exec jest --runTestsByPath tests/terminalUxBrowserProof.test.tsx --runInBand
• pnpm --dir uapi exec tsc --noEmit --pretty false --project tsconfig.json
• git diff --check
• pnpm --dir uapi run test:e2e:terminal-ux
• Local browser proof on http://127.0.0.1:3109/terminal with agent-browser: content present, no framework overlay, annotated landmark/control snapshot captured.

Notes

• Left the pre-existing unstaged packages/protocol/data/state.json canon-posture mutation out of this Gate 9 commit because it is not part of the Terminal browser-proof gate.

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Project	Deployment	Actions	Updated (UTC)
engi-uapi	Ready	Preview, Comment	May 21, 2026 4:04pm