update .env.example

.env.example

@@ -1,10 +1,31 @@
 # trex-core slot-core daemon configuration (copy to .env; .env is gitignored).
 # Real OS environment variables take precedence over values in .env.
 
-# Required: psycopg DSN for the PostgreSQL single-writer store.
+# --- Core (required) ---
+# psycopg DSN for the PostgreSQL single-writer store.
 TREX_POSTGRESQL_DSN=dbname=trex_core host=/var/run/postgresql
 
-# Optional (defaults shown).
+# --- Daemon (optional, defaults shown) ---
 TREX_TOTAL_SLOTS=10
 TREX_API_HOST=127.0.0.1
 TREX_API_PORT=8080
+# Background execution loop tick interval (seconds).
+TREX_EXECUTION_INTERVAL_SEC=1.0
+
+# --- Broker selection (REQ-011/012/013) ---
+# 'paper' (deterministic test double, default) | 'kis' (real KIS Open API)
+TREX_BROKER=paper
+
+# --- KIS broker (only when TREX_BROKER=kis) ---
+# 모의투자(sandbox): https://openapivts.koreainvestment.com:29443
+# 실계좌(live, 실자금): https://openapi.koreainvestment.com:9443  (requires TREX_KIS_ALLOW_LIVE=true)
+TREX_KIS_BROKER_BASE_URL=https://openapivts.koreainvestment.com:29443
+TREX_KIS_BROKER_TIMEOUT=5
+TREX_KIS_BROKER_APP_KEY=
+TREX_KIS_BROKER_APP_SECRET=
+TREX_KIS_BROKER_ACCOUNT_REF=12345678-01
+# Gate for real-account trading. Leave unset/false to stay on 모의투자.
+TREX_KIS_ALLOW_LIVE=false
+# Optional: Redis URL for KIS token cache (restart / multi-process survival, REQ-016).
+# Unset => in-memory token cache only.
+TREX_KIS_REDIS_URL=