a11y(external-links): keep localized tooltip supplemental to persistent context

[seonghobae]

Current exact authority

• protected base: main@8103aad3582a024946b835d7eee858f65339a184
• exact head: aa1dde72f5091ea2c5e78ebc006776f0c7cf7e7d
• lifecycle: Draft / localized-title experiment only / persistent accessible context still RED

Valid delta retained

This branch localizes the supplemental title text for every target="_blank" link through the existing KO/EN runtime and preserves rel="noopener noreferrer". The generated .Jules/palette.md repository-wide doctrine was removed in normal descendant aa1dde72...; the file is byte-identical to protected authority. No force push or destructive rebase was used.

Accessibility RED

title / data-i18n-title is not sufficient evidence that a keyboard or screen-reader user receives the new-window context before activation. The current tests only inspect source tokens and do not establish an accessibility-tree description. Therefore this PR must not claim completed screen-reader support.

The overlapping owner lane is #210. Its accepted GREEN must preserve this branch's valid localized supplemental tooltip semantics while adding one reusable persistent programmatic context for every blank-target link (for example a single localized description node referenced with aria-describedby, or equivalent). Locale changes must update the same context rather than append duplicate announcements; blank-target links must retain rel="noopener noreferrer".

#210 may supersede this PR only after the complete valid delta here is present in its exact tree and current-head browser/accessibility evidence is GREEN. Until then both PRs remain open; do not close merely for overlap.

Browser Delivery Gate

Before Ready: keyboard-focus affected links; inspect their computed accessible name/description; switch every currently supported locale and prove one announcement per link; verify desktop/intermediate/mobile layout with no overflow or focus clipping; and capture current-head E2E/screenshot evidence. Static Python/string checks are source evidence only.

Current Delivery Gate: 의도성 PASS / 기능 완전성 FAIL / 콘텐츠 적합성 PASS / 복원력 FAIL / 증거성 FAIL / 고유성 N/A.

The current site runtime remains KO/EN-only and file-bundled; this PR does not expand that architectural debt. The fleet target for KO/EN/JA/ZH/VI/ES/DE/FR is a versioned translation-resource boundary rather than permanently growing a browser-side catalog.

Fresh checks and review must be evaluated on unchanged aa1dde72...; predecessor evidence does not transfer. No Pages publication, browser acceptance, security-vulnerability closure, self-approval, gate weakening, source-neutral retrigger, generated doctrine, force push, or destructive rebase is claimed.

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