feat: add temporal validity guardrails - #3
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Add companion stability, multivariate Portmanteau whiteness, multiplicity adjustment, and bounded all-directions Granger scans. Cross-check the numeric path against base R and document the conservative integration gate for downstream consumers. Co-Authored-By: OpenAI Codex <codex@openai.com>
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Summary
Validation
Compatibility
Additive pre-1.0 release. Existing pairwise Granger, VAR fitting, lag selection, single-direction conditional tests, and bootstrap behavior are unchanged.