Ota v1.6.27 Adds Pre-Execution Refusal Boundary for Database Schema Mutations

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Ota version 1.6.27 has been released, introducing a narrow mechanism that allows the tool to evaluate and refuse database-schema mutation commands before any execution or setup begins. The update derives key contract details — including resource bindings, migration bytes, and policy decisions — ahead of the execution path, enabling a machine-readable refusal with execution_started set to false. Provider execution remains disabled in this release, meaning the feature is strictly a reviewed refusal boundary rather than a database execution or protection system. Policy packs can assess typed-effect realizations using a deterministic deny-warn-allow precedence, while typed lanes stay provider-disabled even if policy resolves to allow or warn. Additional changes include improved GitHub Actions directory handling, stricter archival re-derivation, and a new review-only bridge command for contract authoring.

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