Add data-pack Age runtime profiles (#9)

docs/PORTING.md

@@ -47,7 +47,8 @@ Age references use UUIDs rather than dimension keys. The server-owned Age
 registry maps each stable identity to its immutable definition and runtime
 dimension, keeping saved books valid if an Age is migrated or regenerated.
 Operational lifecycle and unload behavior are documented in
-[AGES.md](AGES.md).
+[AGES.md](AGES.md). The server data-pack schema for runtime generation is
+documented in [AGE_PROFILES.md](AGE_PROFILES.md).
 
 The core mod must remain usable without Create, Ponder, or Immersive Portals.
 The built-in legacy animation is the dependency-free destination preview.