[Tcode-Motion]

🎯 What: Refactored the excessively long cmd_install function in python-installer/techscript/__main__.py by extracting platform detection, existing install checks, release binary downloading, and result reporting into modular helper functions (_detect_and_validate_platform, _handle_existing_install, _download_release_binary, and _print_install_result).
💡 Why: Reduces function complexity, improves code readability, and makes individual installation steps independently testable.
✅ Verification: Verified through python unit tests in python-installer/tests/test_installer.py (python3 -m unittest discover -s python-installer/tests) and the full workspace test suite (cargo test --workspace --all-targets).
✨ Result: cmd_install is now concise, readable, and well-structured without changing runtime behavior.

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PR created automatically by Jules for task 15972880421157306117 started by @Tcode-Motion

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