refactor: clean up exception.py - add __all__ and remove redundant pass statements

[Atman36]

What

• Added __all__ declaration to explicitly export the 7 public exception classes
• Removed redundant pass statements from all exception class bodies (unnecessary after docstrings)

Why

• __all__ improves API clarity and enables from kimi_cli.exception import * to work correctly
• Removing unnecessary pass statements reduces visual noise and follows Python best practices
• No functional changes — purely code quality improvements

How to verify

# Syntax check
python3 -m py_compile src/kimi_cli/exception.py

# Verify __all__ is correct
python3 -c "from kimi_cli.exception import __all__; print(__all__)"

Notes

• Breaking change: No
• Risk: Low
• Files changed: 1

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PR prepared with AI assistance (Claude Code PR Factory)

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.