[codex] Show metrics follow-up command

[Hynek Kydlíček (hynky1999)]

Summary

• Add a Metrics follow-up command after detached cloud submissions when the stage index is known.
• Update the CLI docs example to show the same command.
• Add focused tests for follow-up command output with known and unknown stages.

Why

Cloud launch follow-up output already pointed users to attach, summary, logs, workers, and cancel commands, but omitted the CLI metrics command even though stage metrics are available through macrodata jobs metrics.

Validation

• uv run ruff format --force-exclude src/refiner/cli/run/modes.py tests/cli/test_run_modes.py
• uv run ruff check --force-exclude src/refiner/cli/run/modes.py tests/cli/test_run_modes.py
• uv run pytest tests/cli/test_run_modes.py

[gemini-code-assist]

Code Review

This pull request introduces a new Metrics command to the cloud followup commands outputted by the CLI. Specifically, it updates emit_cloud_followup_commands to print the metrics command when a stage index is available, updates the corresponding documentation, and adds unit tests to verify this behavior under both known and unknown stage scenarios. There are no review comments, and I have no additional feedback to provide.

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