fix(makefile): use fuser port-kill instead of pkill pattern for restart

pkill -f matched the shell subprocess's own argv (which contains the
pattern as a -c argument), causing make to receive SIGTERM and abort.
fuser -k 8000/tcp / 3000/tcp targets only the process bound to the
port — no self-kill risk.

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

state-hub/Makefile

@@ -36,7 +36,7 @@ mcp-http:
 	MCP_TRANSPORT=sse MCP_PORT=8001 uv run python mcp_server/server.py
 
 dashboard:
-	@pkill -f "observable preview" 2>/dev/null && echo "Stopped running dashboard" || true
+	@fuser -k 3000/tcp 2>/dev/null && echo "Stopped running dashboard" || true
 	cd dashboard && npm run dev
 
 check:
@@ -115,7 +115,7 @@ backend: db
 	  sleep 1; \
 	done
 	$(MAKE) migrate
-	@pkill -f "uvicorn api.main:app" 2>/dev/null && echo "Stopped running API" || true
+	@fuser -k 8000/tcp 2>/dev/null && echo "Stopped running API" || true
 	$(MAKE) api
 
 ## Register a project: make register-project DOMAIN=railiance PROJECT_PATH=/home/worsch/railiance