feat(eval-author): scaffold the nemo eval-author CLI surface

[aleckhoury]

Closes ASE-685.

Summary

• Registers nemo eval-author with discover, audit, propose, run, and doctor. Simply scaffolding spaces for commands so we can parallelize more easily
• Follows the two sibling optimizer CLIs rather than inventing a shape: a single cli.py holding a NemoCLI subclass whose get_cli() declares commands inline, matching ExperimentalistCLI and InsightsCLI down to the no-op root callback.

Summary by CodeRabbit

• New Features

  • Added the nemo eval-author command with discover, audit, propose, run, and doctor subcommands.
  • Added CLI help output describing the available evaluation-authoring commands.

• Bug Fixes

  • Not applicable; the subcommands currently indicate that implementation is pending.

• Tests

  • Added coverage for command discovery, help output, pending-command behavior, and CLI registration.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds the nemo eval-author CLI plugin, registers five placeholder verbs, adds the nemo-platform-plugin dependency, and tests command help, failure responses, entry-point metadata, and class loading.

Changes

Eval Author CLI

Layer / File(s)	Summary
CLI registration and command scaffolding plugins/nemo-eval-author/pyproject.toml, plugins/nemo-eval-author/src/nemo_eval_author_plugin/cli.py	Registers eval-author to EvalAuthorCLI, adds the platform dependency, and defines discover, audit, propose, run, and doctor placeholder commands.
CLI and entry-point validation plugins/nemo-eval-author/tests/test_cli.py	Tests help output, placeholder exit codes and ticket messages, entry-point metadata, and loading of EvalAuthorCLI.

Suggested reviewers: a2bondar, aahunt-nv, ajaythorve

Sequence Diagram(s)

sequenceDiagram
  participant NemoCLI
  participant EvalAuthorCLI
  participant TyperApp
  NemoCLI->>EvalAuthorCLI: load eval-author entry point
  EvalAuthorCLI->>TyperApp: register CLI verbs
  TyperApp->>EvalAuthorCLI: invoke selected placeholder
  EvalAuthorCLI-->>TyperApp: return ticket error and exit code 1

Loading

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: scaffolding the nemo eval-author CLI surface.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ase-685-eval-author-cli-scaffolding/akhoury

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_{Comment @coderabbitai help to get the list of available commands.}

[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	28180/36015	78.2%	62.6%
Integration Tests	16417/34733	47.3%	19.7%