fix(cli): default LoRA downloads to merged checkpoints

[cursor]

Summary

• default omitted LoRA checkpoint types to merged, matching the CLI contract
• preserve explicit merged, adapter, and default behavior
• add regression coverage for downloading a LoRA job without --checkpoint-type

Context

The daily CLI failure export contained Invalid checkpoint type for LoRATrainingType: None. Main still reproduced the bug, and no existing PR covered it.

Tests

• uv run pytest -n 0 tests/cli/test_fine_tuning.py::TestFineTuningDownload
• uv run ruff check src/together/lib/cli/api/fine_tuning/download.py tests/cli/test_fine_tuning.py
• uv run ruff format --check src/together/lib/cli/api/fine_tuning/download.py tests/cli/test_fine_tuning.py
• uv run pyright src/together/lib/cli/api/fine_tuning/download.py

  

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