fix: defer history mkdir warning until console exists

[Alphaxiaoteng]

Summary

• Fixes Uncaught AttributeError in io.py line 979 #5669: when creating the input-history directory failed, __init__ called tool_warning before self.console existed, raising AttributeError and aborting startup.
• Defer that warning until after console initialization, then emit it normally.
• Add a regression that patches Path.mkdir to fail and asserts construction succeeds with input_history_file cleared.

Test plan

• pytest tests/basic/test_io_history_mkdir.py -q → 1 passed
• Confirmed no crash / console is available after the failed mkdir path

Made with Cursor

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