polyc-query 2026.9.6

The Query plane's read model: a DataFusion engine over signed projection artifacts, behind a verified credential.
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The projected query read path: exact, signed projection artifacts answered through DataFusion behind a verified credential.

This crate is the Query plane's read model. A deployment composes [core_service::ProjectedCoreService] once at startup, then runs each credential-bearing request through it. Everything between those two points stays private: core_resolution plans the statement against the closed catalog, core_execution executes it over verified artifacts, statement_gate admits only query-shaped ASTs, and credential carries the two sealed impls polyc-query-credential's witness needs. Nothing outside this crate can assemble those parts in an order [core_service] never checked — see that module's own doc for the seam.

[QueryLimits], re-exported here because it is a plain resource-ceilings struct the service composition takes by value, is the one other public item — every field on it is one the projected path reads. The wire JSON envelope is [polyc_query_model::QueryResultJson]: it lives in the DataFusion-free protocol vocabulary crate (POLY-359), so a caller names it without linking this engine.