feat(.pochi): add vscode skill for extension development and debugging

[zhanba]

Summary

• Adds .pochi/skills/vscode/SKILL.md — a skill that guides agents to launch VS Code with the Pochi extension loaded in development mode via CDP
• Documents the full workflow: launch → connect agent-browser → snapshot → interact → cleanup
• Includes workarounds for VS Code's sandboxed webview limitations (screenshots + pixel-coordinate clicks) and known agent-browser frame switching bug

Test plan

• Verify the skill is discoverable by the vscode skill name
• Follow the documented launch command and confirm VS Code opens with the extension in dev mode
• Confirm agent-browser can connect on port 9223 and take a snapshot/screenshot

🤖 Generated with Pochi | Task

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 14.27%. Comparing base (eb58f10) to head (f4fc997).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1326   +/-   ##
=======================================
  Coverage   14.27%   14.27%           
=======================================
  Files         690      690           
  Lines       64710    64710           
  Branches     1824     1757   -67     
=======================================
  Hits         9236     9236           
  Misses      55191    55191           
  Partials      283      283           

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