fix: downgrade resource module ImportError log from warning to debug on Windows

[Copilot]

• Change logger.warning to logger.debug at import time (no stderr noise on every import)
• Add logger.warning inside get_max_memory_usage when resource is None (warn only when the feature is actually attempted)
• Update test to match the new warning message

[xhluca]

@copilot that's fine but warning should be inside the usage of resource

[Copilot]

@copilot that's fine but warning should be inside the usage of resource

Done in 8b17975. The logger.warning is now inside get_max_memory_usage (when resource is None and memory usage is actually requested), while the import-time handler uses logger.debug to avoid spurious stderr output on every import.

[xhluca]

@copilot fix the error

[Copilot]

@copilot fix the error

Fixed in 62d6bbe. The CI failure was a test asserting the old warning message "resource module not available on Windows" — updated it to match the new message "resource module not available, cannot get memory usage" that's now emitted at the usage site.