Reasoning models (gemma-4, qwen3-thinking) burn the entire max_tokens
budget on <thinking> output and return empty visible content, so the
captioner produced zero captions for every image. Pass
chat_template_kwargs={enable_thinking: false} per-request to skip the
reasoning phase, and bump max_tokens 120 -> 200 as headroom.
Both modules used stdlib logging.getLogger which is not bridged to the
project's structlog config, so every probe / captioner log was silently
dropped. Switch to loggers.get_logger and convert %-format calls to
structlog kwargs so the captioning path becomes observable.
