Neutral cross-domain primitives shared by Condor owner crates.

Holds only lane-agnostic types: continuous [Point2] and the search outcome surface in [search]. Domain algorithms, scene geometry, grids, and prepared builders stay in their owner crates. The facade re-exports selected items; consumers should prefer condor over depending on this crate directly unless they are implementing a domain crate.

Shared outcome vocabulary

A valid search can compute either a route or no route; both carry algorithm-defined statistics. Input validation is deliberately separate and remains an outer owner-specific Result::Err.

use condor_core::SearchOutcome;

let outcome = SearchOutcome::<&str, usize>::no_path(4);
assert!(!outcome.is_found());
assert_eq!(outcome.path(), None);
assert_eq!(outcome.stats(), &4);