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perf(signals): mapArray small-move fast path for keyed reorders (#3227)

Bounded small-move pre-pass (trySmallMove) on mapArray's keyed update path: rotations, swaps, and small displacements (≤32 displaced rows after prefix/suffix trim, >64-row window) commit as targeted in-place moves instead of full-window rebuilds; ineligible shapes fall through to the untouched general algorithm after a few probes. Identity-keyed mode only — custom key functions and index-tracking modes never enter it. Scan and commit are separate functions so updateKeyedMap stays within JIT inlining budgets (no reverse/shuffle regression).

Validation: mapArray-smallmove.test.ts pins semantics at 1000-row scale against an oracle driven through the general path (rotate, displace, swap, remove, replacement, duplicates, mixed shapes, custom-key exclusion); engagement is proven through a dev-only counter and gated under SIGNALS_TIER=prod. js-framework-benchmark: swap1k −6.5%, no regressions across create/replace/append/remove/select/clear.

Size: ~600 B brotli in every <For> scenario; limits ratcheted with re-measured notes on the rebased tree.

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