Raise fixed-schema Excel table default to 5 million cells - #2327
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What changed
Why 5 million
The default is a resource-policy guardrail, not an out-of-memory prediction. Benchmarks on the existing saved-workbook DataTable scenario measured about 0.70 seconds / 171 MB total allocation at 2 million cells, 1.19 seconds / 387 MB at 5 million, and 1.83 seconds / 705 MB at 8.39 million. Five million accommodates common reporting workloads such as roughly 100,000 rows by 40 columns while retaining a finite default for unattended or tenant-controlled generation. Actual cost still varies with string sizes, styles, and workbook features.
Base
The safety enforcement and actionable override guidance from #2323 are now on master. This PR is rebased on that merged implementation and changes only the fixed-schema default plus its public guidance.