feat(launcher): prune old run logs (L-2)

src/config.py

@@ -66,6 +66,15 @@ class Settings(BaseSettings):
     agent_kill_grace_seconds: int = 20
     agent_timeout_overrides_json: str = ""
 
+    # L-2: run-log rotation. Old per-run logs in <data>/runs/*.log are pruned at
+    # app startup (best-effort). A *.log is removed if it is older than
+    # log_keep_days OR not within the log_keep_max most-recent logs (whichever
+    # hits first). Only *.log files are touched; the active run log is skipped.
+    #   log_keep_days -> max age in days (env ORCH_LOG_KEEP_DAYS).
+    #   log_keep_max  -> max number of newest logs to retain (env ORCH_LOG_KEEP_MAX).
+    log_keep_days: int = 30
+    log_keep_max: int = 500
+
 
     # Telegram notifications
     telegram_bot_token: str = ""