[SyMind]

🎯 Changes

Rsbuild Start compilation currently uses api.transform plus a separate post loader to persist server-function metadata. Replace both with one pre loader that compiles the source and writes module.buildInfo in the same invocation.

• Remove the pending metadata maps, loader-context setter, and metadata-only loader.
• Keep compiler ownership, queued compilation, dependency tracking, watch invalidation, and cached metadata replay in the host.
• Preserve pre-transform ordering, compiler virtual modules, source-map composition, and stale metadata clearing.

Local validation before rebasing onto current main:

• Core unit tests: 885 passed, 1 expected failure; available unit/type/lint/package checks passed for core and React/Solid/Vue Start.
• Four Rsbuild integration tests passed: warm cache, cache disabled, watch removal/restoration, and pre-transform ordering.
• The module syntax-error overlay test passed.
• All 18 bundle scenarios were unchanged from the preceding implementation refactor.

Local A/B experiments did not establish a consistent end-to-end speedup; this PR makes no performance claim.

AI-assisted implementation and tests using OpenAI Codex. Submitted as a draft for review.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested code changes locally with the relevant test commands, or tests do not apply to this pull request.
• I fully understand the code in this pull request, including any code generated with AI assistance.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

🦋 Changeset detected

Latest commit: f9911d2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@tanstack/start-plugin-core	Patch
@tanstack/react-start-rsc	Patch
@tanstack/react-start	Patch
@tanstack/solid-start	Patch
@tanstack/vue-start	Patch

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