This release fixes issues for SREs watching stability and regressions.
✓ No known CVEs patched in this version
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Summary
AI summaryFixed Help TOC scroll-spy behavior and debug marker issues.
Full changelog
[1.59.9] — 2026-05-21
fix(ux): UX-A5-r4 (v1.59.9) — Help TOC scroll-spy debug marker + behavioural lock-test. Sixth-cycle closure: previous five attempts (v1.58.45 / v1.58.52 / v1.59.0 / v1.59.3 / v1.59.8) all shipped with passing static tests but the bug stayed open because the tests asserted source-shape, not behaviour. v1.59.9 fixes the gap: (1) <body data-toc-spy="active"> debug marker — single selector any tester can use to answer "is the spy alive?" without needing to scroll; (2) synchronous initial paint at mount tail covers the router-pre-paints-view case; (3) double-rAF re-compute covers the route-handler-returns-before-router-appends case; (4) resize listener subscribed so viewport-flip mid-scroll re-paints; (5) cleanup removes BOTH listeners and the marker on hashchange. public/js/views/help.js algorithm: linear scan with else break; short-circuit (O(active-index) per scroll event). New tests/help-toc-spy-behavior.test.mjs runs the algorithm against 6 synthetic-geometry scenarios + 1 algorithm-parity check against help.js source — the test fails if the algorithm regresses, before any browser run. 973 → 982 unit. (UX-A5-r4)
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