chore: publish the webjs VS Code extension to VS Marketplace + Open VSX

[vivek7405]

Goal

Publish packages/vscode (the webjs extension) so it is discoverable in VS Code and its forks. Owner-driven (needs marketplace accounts + tokens; cannot be automated by an agent).

Steps

VS Marketplace (VS Code)

• Create the webjsdev publisher at https://marketplace.visualstudio.com/manage (Microsoft account).
• Create an Azure DevOps PAT (https://dev.azure.com, All accessible orgs, scope Marketplace > Manage).
• cd packages/vscode && npx --yes @vscode/vsce login webjsdev (paste PAT).
• npm run publish:vsce.
• Verify https://marketplace.visualstudio.com/items?itemName=webjsdev.webjs

Open VSX (Cursor / Windsurf / VSCodium)

• Sign in at https://open-vsx.org with GitHub; generate an access token.
• npx --yes ovsx create-namespace webjsdev -p <TOKEN> (once).
• npm run package && npx --yes ovsx publish webjs.vsix -p <TOKEN>.
• Verify https://open-vsx.org/extension/webjsdev/webjs

Notes

• Bump packages/vscode/package.json version before each publish (currently 0.2.0).
• Full runbook: packages/vscode/PUBLISHING.md.
• Acceptance: both listings live and installable; the extension activates and lights up template highlighting + the tsserver plugin on a real webjs app.

Follow-up to epic #381 (Phase 1 #382 shipped the packaging; this is the actual publish).