follow-up: migrate users toward lazyPlugins to avoid eager plugin side effects

[crusty-voidzero]

Summary

We should follow up on migrating Vite+ users toward lazyPlugins so plugin side effects do not run unexpectedly in long-lived/background processes.

Problem

A persistent Node process in the background ended up running a Vite plugin that touched the file system when it should not have. In the reported case, this happened through oxlint --lsp via VS Code.

That suggests some plugin work currently runs too eagerly, and users need a clearer migration path toward lazyPlugins to avoid side effects in non-build / non-dev execution contexts.

Proposed follow-up

• Audit current Vite+ guidance around plugin execution timing
• Document and/or implement the migration path to lazyPlugins
• Identify common cases where plugin side effects can be triggered unexpectedly (LSP, persistent workers, editor integrations, background tooling)
• Provide clear recommendations for plugin authors and Vite+ users

Acceptance criteria

• We have a concrete migration/follow-up plan for lazyPlugins
• Users have guidance on avoiding eager plugin side effects
• The oxlint/LSP-style background-process case is covered explicitly