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Return the path of the active debug log file, or None if not logging.

Reflects the file handler actually attached by configure_debug_logging, not the current DEEPAGENTS_CODE_DEBUG env value. The two diverge when the variable is set after import — e.g. via a project/global .env loaded during settings bootstrap — in which case the variable reads truthy but no handler was installed and no log file exists. Callers that surface "full error in " hints must use this rather than the env var to avoid pointing users at a file that was never created.