Langfuse uses {{variable}} syntax in its prompt management UI, while the
hardcoded fallbacks use {variable} (Python str.format). The previous code
always called .format() which silently failed/errored when a real Langfuse
prompt was fetched.
- langfuse_client.py: add compile_prompt(template, prompt_obj, **vars)
→ uses prompt_obj.compile(**vars) when Langfuse is available
→ falls back to template.format(**vars) when using the hardcoded fallback
- agent_runner.py: replace .format() with compile_prompt() for
unified_processing (V2 local) and batch_cloud_processing (cloud agent)
- agent_setup.py: replace .format() with compile_prompt() for journey_system
deep_agent.py prompts have no variables, so no change needed there.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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