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    Variable UI_STAGEDConst

    UI_STAGED: readonly string[] = ...

    Everything §73–§75 names that this MVP does not ship, each with the dated note the plan requires.

    Exported as data rather than left in prose so the staging is greppable, assertable in tests, and printable by a diagnostics overlay — the shape @fourjs/diagnostics' DEBUG_DRAW_STAGED established. Nothing reads it at runtime; it is documentation that cannot drift out of the build.

    An entry leaves this array when the thing ships. §75's keyboard navigation and focus order left it on 2026-08-07 (A-13): @fourjs/input gained the key source that was its stated blocker (A-10), and keyboard.ts now implements Tab/Shift-Tab traversal while Button implements Enter/Space activation. The hidden DOM mirror, screen-reader updates, high-contrast hook, and scalable text left it on 2026-09-06 (A-13 remainder): installAccessibilityMirror is the opt-in consumer of this record.