fix: handle circular SSR module graphs

[tonoizer]

Summary

• reserve deterministic temp-file paths before traversing remote SSR imports
• avoid awaiting an ancestor's in-flight fetch when an ESM graph contains a cycle
• wait for every discovered module writer before importing the completed graph
• clear reserved path entries together with the existing SSR loader cache

Testing

• pnpm typecheck
• pnpm fmt.check
• pnpm test (746 passed, 1 skipped)
• pnpm build
• packaged-loader reproduction: a two-module circular SSR graph resolves instead of timing out

Risks

• The change is scoped to the HTTP-to-temp-file SSR loading strategy. It preserves existing deterministic filenames and cache keys, but changes in-flight cache hits to use a reserved destination path so circular graphs can complete.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@module-federation/vite@916

commit: 8a5c489

[gioboa]

Tests With Different Frameworks

[gioboa]

@tonoizer that's awesome 💪 Thank you