feat(mf): emit RSC metadata in federation manifests

[ScriptedAlchemy]

Summary

• Emit rsc metadata for shared, exposes, and remotes in mf-stats.json and mf-manifest.json
• Align shared manifest identity (name = pkgName, shareKey = federated identity) and preserve aliased remote lookup paths for manifest consumers
• Add focused regression coverage for the manifest producer contract and remove brittle debug-only assertions from that fixture

Stack

Current stack, bottom to top:

• #12977 feat(mf): layer-aware sharing and runtime scope-array support
• #13203 feat(mf): emit RSC metadata in federation manifests <- this PR
• #13204 feat(rsbuild): add RSC federation host/remote example
• #13208 feat(rsbuild): add RSC federation module patterns
• #13215 feat(rsc): register federation manifest data at runtime

Why This PR Exists

This PR defines the manifest producer contract that later runtime code consumes. Shared-entry identity, aliased remote lookups, and manifest-level RSC metadata belong here because they change what the manifest emits.

References

• Focused regression: tests/rspack-test/configCases/container-1-5/manifest-rsc-references

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

[github-actions]

Rsdoctor Bundle Diff Analysis

⚠️ Note: The latest commit (354076ee82) does not have baseline artifacts. Using commit 475e5a937e for baseline comparison instead. If this seems incorrect, please wait a few minutes and try rerunning the workflow.

Found 5 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Change
react-10k	5.7 MB	0
react-1k	826.2 KB	0
react-5k	2.7 MB	0
rome	984.2 KB	0
ui-components	2.3 MB	0

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[github-actions]

📦 Binary Size-limit

Comparing ee282a6 to feat!: remove .wasm from default js extensions (#13321) by hardfist

❌ Size increased by 83.63KB from 49.01MB to 49.09MB (⬆️0.17%)

[codspeed-hq]

Merging this PR will not alter performance

✅ 16 untouched benchmarks
⏩ 3 skipped benchmarks¹

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_{Comparing cursor/manifest-rsc-client-data-d493 (ee282a6) with feat/mf-layers (6ab4004)²}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on feat/mf-layers (96e7c01) during the generation of this report, so 1e26be9 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

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