Add VS Code Studio connector scaffold

[chubes4]

Summary

• generate an initial plugins/vscode/ VS Code extension scaffold
• add commands to check the Studio CLI and show/copy WordPress Studio MCP config
• include shared skills, generated MCP config, docs, and verifier coverage

Fixes #81

Notes

• The VS Code Marketplace publisher is intentionally a placeholder until ownership is decided.
• This does not publish to the Marketplace or add publishing credentials.

Testing

• pnpm build
• pnpm verify
• node --check plugins/vscode/extension.js

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafted and implemented the VS Code connector scaffold, generated output, docs, and verification, then ran build and syntax checks.

[chubes4]

Updated to remove the placeholder publisher entirely. The generated VS Code manifest now uses publisher: "automattic", and docs/verifier checks were updated accordingly.

Verification after update:

• pnpm build
• pnpm verify
• node --check plugins/vscode/extension.js

[chubes4]

Updated verifier reporting while resolving the rebase: the success message now comes from the executed verification task list, and failures are prefixed with the surface name.

Verification after update:

• pnpm build
• pnpm verify
• node --check plugins/vscode/extension.js