docs: enterprise refactor plan with ralph specs

src/server/logger.ts

@@ -0,0 +1,10 @@
+/**
+ * Structured logger using pino.
+ * Log level configurable via ABE_LOG_LEVEL env var (default: 'info').
+ */
+
+import pino from 'pino';
+
+const level = process.env['ABE_LOG_LEVEL'] ?? 'info';
+
+export const log = pino({ level });