Requested by Can · project thread

#What this changes

Gets the editor extension ready for the Visual Studio Marketplace and Open VSX (apps/vscode/PUBLISHING.md listed both as open items before the first upload):

• node apps/vscode/scripts/package.mjs --marketplace builds diffinery-<version>-marketplace.vsix: the same extension with diffinery.checkForUpdates off by default, so a marketplace install doesn't also offer diffinery.com's build. The file diffinery.com serves is unchanged apart from the license.
• Both builds ship the repository's LICENSE as extension/LICENSE.txt, declared as the package's license asset (what vsce does), so the marketplaces show it.
• PUBLISHING.md: those two steps are done; the publisher's display name is Codician; uploads use the marketplace build.

#How it was tested

• New apps/vscode/test/package.test.ts: the update default in both builds, the license file and its manifest asset.
• pnpm exec vitest run and tsc --noEmit in apps/vscode pass; built both .vsix files and checked their contents with unzip.

#Checklist

• pnpm -r typecheck and pnpm -r test pass
• User- or admin-visible changes update the docs in apps/diffinery/docs (no user-visible change; PUBLISHING.md updated)
• New D1 migrations use the next free number in apps/diffinery/migrations (none)

🤖 Generated with Claude Code

https://claude.ai/code/session_0156222tQpRPtP1Em3kEeZnK