fix: remove env section from langflow agent.yaml

All env vars are either hardcoded defaults in podman-compose.yml or
auto-generated by make init — none are user-provided config.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mpk-droid

agents/langflow/simple_tool_calling_agent/agent.yaml

@@ -3,11 +3,3 @@ displayName: "Langflow Simple Tool Calling Agent"
 framework: langflow
 description: "Tool-calling agent built with Langflow's visual flow builder. Calls external APIs as tools and reasons over results."
 deploymentModel: flow-import
-env:
-  required:
-    - POSTGRES_USER
-    - POSTGRES_PASSWORD
-    - POSTGRES_DB
-  optional:
-    - LANGFUSE_ADMIN_PASSWORD
-    - LANGFUSE_ENCRYPTION_KEY