Demonstrate shared native Query policy defaults

Parent

Applications reuse QueryClient and generated-prefix defaults without breaking generated identity.

Provide copied examples for common stale/retry policy, prefix defaults, and native call-site options.
Verify observable default merging and native reads/writes under the decided client hash contract.
Evaluate a narrow typed per-operation defaults map from actual repetition and adopt it only if it adds useful behavior.
Any helper retains generated key/function ownership and QueryClient hash ownership and has published type coverage.
Record a concrete native-only decision if a helper merely renames existing Query APIs.