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docs(perf): props lane addendum — public board floors and the hydration key payload

jantimon/css-in-js-bench re-ran on solid-js rc.11 / @yak/solid 0.3.0 with
framework-floor lanes. Records: Solid's floor hydrates 1.5–1.6x React with
mount at parity (claim machinery, O(keyed nodes)); keys are 73% of the
compressed HTML on multifile-shop; re-encoding recovers <=11%, a delta
sidecar or boundary-only keys ~90%; the sidecar's design constraints and
cost sheet (hydrate-neutral, +13% server CPU, autocannon -10-15%, payload
only). Open target 2 becomes the hydrate floor redesign; new target 8
(hydration key payload) is gated on an end-to-end load lane neither board
has.

Co-authored-by: Claude via Cursor <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

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