chore(claude): add record demo skill

[zimeg]

Changelog

N/A - But I am curious if these scripts are useful to docs pages in upcoming builds? 👾 ✨

Summary

This PR adds a claude skill to record demos for PR previews using the vhs package.

Preview

📸 Example of generated "tape" and GIF - the app existed ahead of time which might be useful for intricate setups:

# Demo: slack run + slack app list
Output demos/run-and-app-list.gif

Set Shell "zsh"
Set FontSize 16
Set Width 1200
Set Height 600
Set Theme "Catppuccin Mocha"
Set TypingSpeed 75ms
Set Padding 20

Hide
Type "cd /Users/eden.zimbelman/programming/tools/slack-cli/relaxed-porcupine-80"
Enter
Sleep 500ms
Show

Type "../bin/slack run"
Sleep 500ms
Enter
Sleep 3s
Enter
Sleep 1s
Enter
Sleep 10s
Ctrl+C
Sleep 1s

Type "../bin/slack app list"
Sleep 500ms
Enter
Sleep 3s

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 67.90%. Comparing base (35e1743) to head (911840b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #403   +/-   ##
=======================================
  Coverage   67.90%   67.90%           
=======================================
  Files         218      218           
  Lines       18050    18050           
=======================================
+ Hits        12256    12257    +1     
+ Misses       4640     4638    -2     
- Partials     1154     1155    +1     

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