feat: casan chat optz

packages/casan-harness/scripts/bash/chat-agent-resolver.py

@@ -14,6 +14,8 @@ import os
 import subprocess
 import sys
 
+PYTHON_BIN = sys.executable or "/usr/bin/python3"
+
 
 def project_root() -> str:
     d = os.path.abspath(os.path.dirname(__file__))
@@ -154,7 +156,7 @@ def decision_payload(args, decision: str, reason: str, agent=None, skill="", too
 
 def run_rbac(args):
     r = subprocess.run([
-        "python3", RBAC, "check",
+        PYTHON_BIN, RBAC, "check",
         "--role", args.role,
         "--resource", "chat",
         "--action", "select_agent",