Log resource limit warnings before hard errors

[kyamagu]

Add warning logs when approaching limits (e.g., 80% of limit):

logger.warning(
    f"File size {file_size} is 85% of limit {max_limit}. "
    f"Consider increasing limit if conversion fails."
)

Benefits

• Proactive warning before hitting limits
• Helps with capacity planning
• Better debugging for borderline cases

Implementation Ideas

Add warning checks before each limit validation:

# In svg_document.py
if resource_limits.is_file_size_limited():
    file_size = os.path.getsize(input_path)
    threshold = resource_limits.max_file_size * 0.8
    
    if file_size > threshold:
        logger.warning(
            f"File size {file_size} bytes is {file_size/resource_limits.max_file_size:.0%} "
            f"of limit {resource_limits.max_file_size} bytes."
        )
    
    if file_size > resource_limits.max_file_size:
        raise ValueError(...)

Warning Thresholds

• File size: 80% of limit
• Layer depth: 80% of limit
• Image dimensions: 90% of limit (closer to hard limit)
• Timeout: Warning at 50% elapsed, 75% elapsed

Considerations

• Warnings should respect --loglevel setting
• Should not be too noisy (only warn once per limit type)
• Consider structured logging for machine parsing