MBTI-PDF-RESULT-SNAPSHOT-PARITY-REALIGN-08: realign snapshot print surface

[fermatmind]

What changed

• Bumped the MBTI result-page snapshot surface contract to mbti.result_page_snapshot.v4 on the frontend.
• Removed the MBTI PDF-only summary shell from the result-page snapshot rendering path.
• Restored snapshot print rendering to the real rich result tree: RichResultReport -> MbtiResultShell -> MbtiDesktopCloneShell.
• Preserved server-prefetched snapshot content/status props for desktop clone content injection and fail-closed no-placeholder readiness.
• Strengthened smoke/contract gates so snapshot PDFs reject the core-reading summary shell and require real result-page detail content.

Why

The snapshot export had drifted into a PDF-only core-reading summary shell. The user-facing goal is a result-page snapshot PDF that uses the real result page content tree, not a shortened summary renderer.

Validation

• ./node_modules/.bin/vitest run tests/contracts/result-gotenberg-print-route.contract.test.ts tests/contracts/result-client-view-state.contract.test.tsx tests/contracts/mbti-result-page-pdf-smoke-quality-gate.contract.test.ts tests/contracts/result-private-print-chrome.contract.test.ts
• ./node_modules/.bin/tsc --noEmit
• git diff --check

Intentionally deferred

• No deployment or server configuration changes.
• No production artifact/cache cleanup.
• No CMS, DB, queue, search, or indexing changes.
• No final visual pagination polish.