chore(config): specify --bin in Makefile cargo run targets

Disambiguates binary when multiple bin targets exist in the
server crate.

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

Makefile

@@ -94,7 +94,7 @@ build-client:
 # --- Run ---
 
 server:
-	cd server && cargo run
+	cd server && cargo run --bin settled-reach-server
 
 client:
 	@test -n "$(GODOT)" || { echo "Godot not found. Run 'make setup' first."; exit 1; }
@@ -103,7 +103,7 @@ client:
 game: stop build
 	@test -n "$(GODOT)" || { echo "Godot not found. Run 'make setup' first."; exit 1; }
 	@echo "Starting server..."
-	@cd server && cargo run &
+	@cd server && cargo run --bin settled-reach-server &
 	@sleep 2
 	@echo "Starting client..."
 	@SR_LIVE=1 $(GODOT) --path client
@@ -290,7 +290,7 @@ perf-baseline:
 
 debug-schedule:
 	@echo "Dumping bevy_ecs schedule graph..."
-	@cd server && cargo run -- --dump-schedule
+	@cd server && cargo run --bin settled-reach-server -- --dump-schedule
 
 content-ron:
 	cd tooling/content-converter && cargo build --release