Island SSR reverted to placeholder approach (full SSR crashed on
reactive code). Placeholders include SX call expression for client
hydration. CSS hides placeholder text until WASM renders.
Remaining: need SX adapter (adapter-html.sx) for island SSR instead
of native Sx_render — the SX adapter handles signals/deref/computed
via the CEK machine. Native renderer doesn't support reactive primitives.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
giles
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