"[GameResource] and NavMesh.GetSimplePath are obsolete on engine 26.07 — use [AssetType] and CalculatePath"

A build that treats warnings as errors fails with CS0618 (member is obsolete) on two APIs that used to be idiomatic: the [GameResource(...)] attribute, and scene.NavMesh.GetSimplePath(...). Verified on engine 26.07.15a (found via offline metadata reflection over bin/managed when building headless).

Both were deprecated in favour of newer surfaces:

• GameResourceAttribute now derives from AssetTypeAttribute and is itself deprecated.
• NavMesh.GetSimplePath (which returned a List<Vector3>) is superseded by NavMesh.CalculatePath, whose result shape is different.

A zero-warnings gate that compiled clean on an earlier engine will now fail on both.

Each modern replacement compiles clean:

1. Resource attribute — use [AssetType]:

// old (obsolete):
[GameResource( "NPC Definition", "npc", "An NPC archetype", Icon = "..." )]

// new:
[AssetType( Name = "NPC Definition", Extension = "npc", Category = "..." )]
public class NpcDefinition : GameResource { ... }

AssetType exposes Name / Extension / Category / IconColor / Flags. There is no Description or Icon constructor argument — drop them. The base class stays : GameResource.

2. Pathfinding — use CalculatePath:

// old (obsolete): List<Vector3>
var pts = scene.NavMesh.GetSimplePath( from, to );

// new:
var path = scene.NavMesh.CalculatePath(
    new Sandbox.Navigation.CalculatePathRequest { Start = from, Target = to } );
if ( path.IsValid )
    foreach ( var p in path.Points )   // IReadOnlyList<NavMeshPathPoint>
        Use( p.Position );             // each point exposes .Position (Vector3)

CalculatePath returns a NavMeshPath struct with .IsValid and .Points, an IReadOnlyList<NavMeshPathPoint>. It is not a List<Vector3>, so index the position via path.Points[i].Position.

Related navmesh surface that is not deprecated: Scene.NavMesh.IsEnabled (gates whether a baked navmesh exists — the scene default is disabled), and GetRandomPoint( pos, radius ) / GetClosestPoint( pos, radius ) returning Vector3?.

The obsolete members still exist for source compatibility but emit CS0618, which a warnings-as-errors gate promotes to a hard failure. Moving to [AssetType] and CalculatePath targets the current, non-deprecated API surface, so the gate passes and you're aligned with the shape the engine will keep supporting.