feat(simulation): NpcBlueprint struct design, RON schema, and validator CLI (#611)

Define ZoneSpec, CultureProfile, and NpcBlueprint structs with serde/RON
deserialization. Ship example RON files as schema contract for the copy
team (#609, #610). Add validate-ron CLI for copy team to lint their files
without compiling the server.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/npc/mod.rs

@@ -4,6 +4,7 @@
 
 pub mod awareness;
 pub mod background;
+pub mod blueprint;
 pub mod disclosure;
 pub mod generate;
 pub mod interaction;