launch-orchestrator: persisted .orch-model file (ORCH_MODEL > LOOP_MODEL > file)

Operator switching models near weekly limits: loops -> sonnet, orchestrator
-> opus. Dotfiles updated (.loop-model/.loop-model-adv=sonnet,
.orch-model=opus) so watchdog restarts keep the choice.

cc-ci-plan/launch-orchestrator.py

@@ -42,7 +42,20 @@ WORKDIR  = os.environ.get("ORCH_DIR",    "/srv/cc-ci-orch")
 LOG_DIR  = os.environ.get("LOG_DIR",     "/srv/cc-ci/.cc-ci-logs")
 
 BACKEND    = os.environ.get("LOOP_BACKEND", "claude")
-LOOP_MODEL = os.environ.get("LOOP_MODEL",   "")
+
+# Orchestrator model: ORCH_MODEL env wins, then LOOP_MODEL, then a persisted file written
+# when the operator changes the model (so watchdog-triggered restarts keep it).
+_ORCH_MODEL_FILE = f"{LOG_DIR}/.orch-model"
+
+def _read_file_default(path, default):
+    try:
+        v = open(path).read().strip()
+        return v or default
+    except FileNotFoundError:
+        return default
+
+LOOP_MODEL = (os.environ.get("ORCH_MODEL") or os.environ.get("LOOP_MODEL")
+              or _read_file_default(_ORCH_MODEL_FILE, ""))
 
 # claude-specific
 CLAUDE_BIN     = os.environ.get("CLAUDE_BIN",   "claude")