Fix fine-tuning metrics CLI zero filters

[cursor]

Target base branch: next.

Summary

• Preserve explicit zero values for fine-tuning list-metrics integer filters when forwarding to the SDK.
• Add CLI coverage asserting --global-step-from 0 and --global-step-to 0 reach the /fine-tunes/{id}/metrics request.

Tests

• python3 -m pytest tests/cli/test_fine_tuning.py tests/test_plots_engine.py -q
• python3 -m ruff check src/together/lib/cli/api/fine_tuning/list_metrics.py tests/cli/test_fine_tuning.py

Reviewers requested: @blainekasten, @artek0chumak

  

[blainekasten]

@cursoragent rebase next in here

[cursor]

Taking a look!

  

[blainekasten]

@cursoragent tests are failing - figure out what to do

[cursor]

Handled.

What happened:

• Old failing head b1fb4de6: test-others failed because Python 3.10 couldn’t parse CLI datetime input ending in Z.
• I fixed that in 490dff12.
• New push then failed lint because ruff format --check wanted tests/cli/test_fine_tuning.py reformatted.
• I ran ruff format, committed/pushed a3464b57 Format fine tuning CLI test, and updated the PR.

Current CI:

• Push run for a3464b57: all passing
  • build ✅
  • test-others ✅
  • test-integration ✅
  • lint ✅
• PR run also green for its required path.

Working tree clean.