Validate columns × (rows + scrollback) against a 1,000,000-cell xterm working-buffer budget, including every resize with the selected scrollback. Document the budget in the advertised MCP input and process-capture guide; never clamp caller dimensions.
Validation: default/exact-boundary schema cases, prelaunch MCP rejection, compiled CLI capture, terminal rendering, normalization, cancellation, and lifecycle checks pass on macOS. This is resource admission, not a measured serializer throughput improvement; Linux-only and real deep-analysis providers were not exercised.
BREAKING CHANGE: process scenarios whose initial or resized terminal exceeds 1,000,000 combined visible-plus-scrollback cells are now rejected before launch.
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