feat(rate-of-closure): keep primary visualizations above the fold

[d-sorgcodexagent]

Summary

Advances #4433 with the visual-first visibility foundation for every registered React and PyQt primary tab.

• inventories and governs all 18 primary surfaces through a strict, deeply immutable cross-runtime manifest
• brings the primary visual or honest semantic preview into the initial viewport instead of requiring explanatory-text scrolling
• fixes responsive ordering and layout at 1440x900, 1280x720, and 390x844
• requires at least 240 px desktop and 180 px narrow visible height for visual landmarks, with meaningful width and ancestor-clipping checks
• audits PyQt at 100% and 150% DPI with one diagnostic PNG per tab and prevents overlap with interactive controls
• sustains the rendered gate in hosted PR and trusted main-push workflows with exact authority-path routing

Stack

• Base: test(rate): add cross-browser and PyQt visual gates #4422 at 75fa75a9266e98f7cf565abc89b83ec1a828e845
• Head: c689e7cf88f254f3b0ba71bd3caf1c0053a4bf44
• This is a normal linear child; no rebase, retarget, or history rewrite.

Evidence

• React Vitest: 895 passed
• production Chromium visibility audit: 2 passed across all manifest viewports
• Python/PyQt/workflow/manifest: 34 passed, including 9 PyQt tabs at both DPI scales and 18 per-tab artifacts
• TypeScript, ESLint, Vite production build, Ruff, Python 3.12 Mypy, actionlint 1.7.12, docs governance, size and diff checks: green
• two independent exact-head reviews: GO

Honest boundary

This does not close #4433. It establishes initial-view visibility and durable audit governance. Shared visualization interaction patterns, complete empty/loading/result/error geometry, approved visual goldens, formal assistive-technology review, user approval, downstream validation, and protected landing remain open.

Human review approval was provided in the coordinating task; GitHub still needs to record whatever formal review/protection state the repository requires.

[d-sorgcodexagent]

Protected-head correction evidence

PR #4435 now points to exact 4dde158109d85df2bf876d73f0c384d482fb989d.

The two actionable hosted failures on earlier heads are closed:

• the mobile toolstrip now shrinks its command strip locally rather than widening the document; the full 11-scenario Chromium/Firefox/WebKit production suite passed locally and the protected Rate web production Worker E2E is now SUCCESS;
• the exact PyQt subprocess support probe is narrowly assertion-policy allowlisted with an adjacent negative policy regression; protected quality-gate is now SUCCESS;
• clean Python 3.12 .[gui,dev] installation now declares the full-window direct pandas/SciPy/SymPy runtime closure, imports RateOfClosureMainWindow, and passes the 100%/150% PyQt visibility test.

No terminal check failures remain on this head. Eleven fleet-routed contexts are still queued; the PR remains draft with no recorded formal review decision, so this is protected-check progress, not merge completion. #4433 remains open.