feat(cmd): add 'list' flag to create command

[srtaalej]

Changelog

The templates available to the create command can now be shown without requiring an immediate selection with the --list flag.

Summary

This PR adds --list flag to slack create to print available app templates non-interactively and to slack create agent to print only agent templates.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.72%. Comparing base (3eef3bd) to head (2724306).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #333      +/-   ##
==========================================
+ Coverage   64.68%   64.72%   +0.03%     
==========================================
  Files         212      212              
  Lines       17782    17809      +27     
==========================================
+ Hits        11502    11526      +24     
- Misses       5206     5208       +2     
- Partials     1074     1075       +1     

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[zimeg]

@srtaalej LGTM! I'm hoping we can extend soon the "agent" argument to the samples command, but this might be blurring the line of what these commands surface... Nothing blocking for this PR!

[zimeg]

⭐ praise: This is a nice filter setup!

[mwbrooks]

✅ Looks great and works well @srtaalej! Thank you!

📝 I've left some minor feedback that we're duplicating code and that it can lead to errors down the road. Non-blocking but perhaps we can add a comment to help reduce errors and remind us to refactor this area?

🍿 Test worked well!

2026-02-09-create-list-flag.mov

[mwbrooks]

suggestion(non-blocking): Not a deal breaker, but I don't like that we're duplicating the categories in 2 areas. In getSelectionOptionsForCategory(...) we already list the category titles and now we're duplicating the categories here. We're also slightly changing the titles ("AI Agent app" vs "AI Agent apps" / "Starter app" vs "Getting started"). This will become more error-prone if we add or change categories later on.

We don't need to refactor this if it's complicated, but we should at least add a comment in both sections noting that changes must occur in the other section. And we should try to keep the naming consistent.