termgrid-core 1.5.5

Deterministic terminal grid state engine with invariant enforcement and backend decoupling.
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# Performance Contract

This document describes performance guarantees provided by termgrid-core.

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## Bounded Mutation

Applying a RenderOp runs in time proportional to affected cells.

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## Damage Escalation

Damage rectangles are capped. Excess fragmentation escalates to full redraw to avoid pathological overhead.

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## Worst-Case Bound

Worst-case per frame is bounded by O(total_cells).