giles 3329512bf8 Add hydration clobber detection test — 55 DOM removals detected ...

MutationObserver injected before page JS boots watches the stepper
island for content removal during hydration. Detects 55 node removals
— the island hydration destroys SSR DOM and rebuilds it, causing a
visible flash.

Test correctly fails: "No clobber: 55 removals"
This is the root cause of the flash — island hydration needs to
preserve SSR content instead of replacing it.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-10 07:40:52 +00:00

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