Walkthrough

This PR migrates many package build configs from unbuild to obuild/config, replacing prior declaration/entries/hooks/externals shapes with bundle/transform style entries (fields like type, input, dts and rolldown). It removes the Rollup timings instrumentation and its helper modules, adds rspack re-exports and a new rspack loader re-export, narrows several test mocks to use targeted spies, casts the schema config default export to InputObject, broadens RuntimeValue<T, B> to include T, and adds an explicit Promise<any> return type to the vite-node-entry default export.

Possibly related PRs

• nuxt/nuxt PR 30648 — Modifies the Rollup timings instrumentation and build-config integration that are removed in this PR.
• nuxt/nuxt PR 33462 — Adjusts the nitro-server package and its build configuration overlapping the nitro-server build.config.ts changes here.
• nuxt/nuxt PR 30043 — Changes schema build configuration and externals handling that overlap the schema build.config.ts updates in this PR.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: migrating Nuxt packages from unbuild to obuild, which is the primary focus across multiple build configuration files.
Description check	✅ Passed	The description is related to the changeset, referencing obuild and providing a link to the project, though it is very brief and lacks detail about the scope or rationale of the migration.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch build/rolldown

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