programs.vscode.extensions was renamed to
programs.vscode.profiles.default.extensions in home-manager. The bare
option still worked via the compat shim but emitted a deprecation
warning on every eval (21× — once per home evaluation in flake check)
and will break when the alias is dropped. userSettings already lived
under profiles.default; extensions now joins it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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