Function solve_with_policy 

pub fn solve_with_policy(
    eph: &dyn EphemerisSource,
    inputs: &SolveInputs,
    with_geodetic: bool,
    policy: SolvePolicy,
) -> Result<ReceiverSolution, SolvePolicyError>

Run SPP under the public API’s language-independent validation/orchestration policy.

Thin compatibility wrapper over the runtime strategy selector (crate::estimation::strategies::estimate): it drives the shared per-technique implementation run under the SPP reference strategy, which resolves to the SPP reference recipe. The reference strategy always yields an SPP solution or an SPP error, so the result is bit-identical to the recipe driving run directly.