feat(experiment): charming scaffolds

[zimeg]

Summary

This PR adds the charm experiment for efforts toward beautiful prompts 🫧 ✨ 🍀

🔗 https://charm.land

Reviewers

Please confirm this appears as a "valid" experiment with the help command:

$ slack help -e charm

Also this can be added to system configurations for ongoing testing:

{
    "last_update_checked_at": "2026-02-23T10:46:08.996245-08:00",
    "experiments": [
        "charm"
    ],
    "surveys": {
        "slack-platform": {
            "asked_at": "2026-02-18T20:30:42-08:00",
            "completed_at": ""
        }
    },
    "system_id": "297fe67b-fbf9-4e40-8c4e-dd9a7b080ed7"
}

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.

[srtaalej]

so excited to introduce charm into the CLI 😁 ✨ 💟

[lukegalbraithrussell]

semi-charmed life indeed

[zimeg]

@srtaalej @lukegalbraithrussell Thanks so much for encouraging these experiment! Let's get this merged 🚢 💨

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.69%. Comparing base (3aa60a2) to head (cff58de).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #348      +/-   ##
==========================================
- Coverage   64.73%   64.69%   -0.04%     
==========================================
  Files         212      212              
  Lines       17805    17805              
==========================================
- Hits        11526    11519       -7     
- Misses       5204     5210       +6     
- Partials     1075     1076       +1     

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