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Oleg Isonen
5141f61f75
## Summary
- generate MCP previews from the standalone React Router template
- prevent Remix and React Router runtimes from being merged into one
dependency graph
- keep the normal Remix build path unchanged
## Root cause
The preview generator combined the complete React Router template with
the Remix defaults template. That installed React Router 7 alongside
Remix-provided React Router DOM 6, causing Vite to fail on incompatible
exports before the iterative preview server became ready.
## User impact
`preview.start({ source: "session", mode: "iterative" })` can now start
successfully, so agents can reuse the preview for fast edit, reload,
screenshot, and vision cycles.
## Verification
- [x] Generated a preview from production-size project data and received
HTTP 200
- [x] Verified the generated package contains React Router and no Remix
router dependencies
- [x] 55 targeted CLI preview, screenshot, and MCP preview tests
- [x] CLI typecheck and formatting
- [x] `pnpm checks`
- [x] `pnpm evaluations` (all three real agent fixtures passed)