update cli sections

[atravitz]

ahead of adding more CLI commands, we should split these into Plan/Run/Gather so they have homes that make sense.

LLM / AI generated code disclosure

LLMs or other AI-powered tools (beyond simple IDE use cases) were used in this contribution: no

Checklist

• All new code is appropriately documented (user-facing code must have complete docstrings).
• Added a news entry, or the changes are not user-facing.
• Ran pre-commit: you can run pre-commit locally or comment on this PR with pre-commit.ci autofix.
• Filled in the AI generated code disclosure.

Manual Tests: these are slow so don't need to be run every commit, only before merging and when relevant changes are made (generally at reviewer-discretion).

• GPU integration tests
• example notebook testing
• packaging tests: run this for any large feature PRs or PRs that add test data.

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[atravitz]

(note: failing tests will be addressed by #2169)

[IAlibay]

I'm approving, but also querying if the news item should really be there.

[atravitz]

(tests passed locally)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.51%. Comparing base (755cfd1) to head (a91b819).
⚠️ Report is 18 commits behind head on epic/execution_improvements.

Additional details and impacted files

@@                       Coverage Diff                       @@
##           epic/execution_improvements    #2171      +/-   ##
===============================================================
+ Coverage                        90.24%   90.51%   +0.27%     
===============================================================
  Files                              209      217       +8     
  Lines                            20475    21395     +920     
===============================================================
+ Hits                             18477    19366     +889     
- Misses                            1998     2029      +31     

Flag	Coverage Δ
fast-tests	90.51% <100.00%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.