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Ivan MalisonandClaude Fable 5.1
f315ccd256
Every coalesced delta rebuilds the stream render model with the same tail. The model re-sliced the tail at the history-window start on every call, so the rendered tail was a fresh array per delta and every WeakMap keyed on it (ordering, history split, turn timing, the layout history cache, row revision) missed each time. Cache the slice by tail identity and window start. Turn timing then still walked the whole rendered tail per delta and allocated a new assistant-timing Map, which the layout memo depends on. Split the walk: the tail is walked once per tail identity and the head is walked from the carried open turn per delta. The Map keeps its identity while the head adds no completed turn. Adds identity-contract tests and a vitest bench for the per-delta pipeline. 200 deltas over a 2,000-item timeline, mean per run: default mounted window 5.68ms -> 2.82ms, history fully revealed 16.95ms -> 1.81ms. Fixes #4816 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>