Clarify awaiting-input handling

[GuyPaddock]

Summary

• reset awaiting-input metadata when commands complete or hard time out
• adjust awaiting-input guidance to use C-c/C-d/C-z terminology
• add tests ensuring awaiting-input flags clear after completion

Testing

• python -m pytest tests/unit/events/test_command_success.py tests/unit/runtime/utils/test_bash_blocking_behavior.py (fails: ModuleNotFoundError: litellm)

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