docs: explain qualified human business decisions

[abrichr]

Summary

• add a standalone guide for qualification-time human business decisions
• distinguish this path from runtime operational attention
• document direct authoring, example and counterfactual capture, review dispositions, and answer/effect semantics
• document local evidence and remote reviewed-presentation boundaries

Validation

• uv run mkdocs build --strict

Scope

This guide documents the merged Flow/Types model. It does not claim the pending Cloud delivery or qualification UI PRs are deployed, and it contains no unaccepted UI capture.