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perf(table-core): shape-stable row/cell/column/header instances Keep one hidden class per instance kind for the whole instance lifetime so V8 property access stays monomorphic: - memoized prototype APIs store memo state in a pre-declared `_memos` holder (plus dedicated `memoSlot`s for render-hot APIs) instead of installing `_memo_<fnKey>` own properties on first call - rows and cells allocate through per-table constructor functions so every field lives in-object; a discarded warmup instance per table pre-marks declared fields mutable to avoid field-constness deopt waves - all post-construction own-property additions declared up front: grouping row fields (the `Object.assign` + per-row `getValue` closure becomes a fixed-arity prototype override), `_cellsCache`, `originalSubRows`, pinned `position` marks; sorted clones rebuilt via `constructRow` - eager per-row cache maps made lazy (`_uniqueValuesCache`, `_groupingValuesCache`); filter maps start as a shared frozen empty map Browser (100k rows, vs 9.1.2): grouped stage -23%, heap -20%; Node construction -21..-35%; steady-state access at parity; %HaveSameMap shape gate passes (fails on 9.1.2). Adds tests/unit/shapeStability.test.ts. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

nx run-many --targets=build --exclude=examples/**

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