feat: add persistent cache for module codegen

[ahabhgk]

Summary

Related links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[github-actions]

📦 Binary Size-limit

Comparing 867abcc to feat: support fine-grained import.meta parser options (#14631) by AsyncIter

❌ Size increased by 129.00KB from 66.53MB to 66.66MB (⬆️0.19%)

[codspeed-hq]

Merging this PR will degrade performance by 12.13%

❌ 2 regressed benchmarks
✅ 41 untouched benchmarks
⏩ 47 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	rust@persistent_cache_restore_after_single_file_change@basic-react-development	4.9 ms	5.5 ms	-12.19%
❌	Simulation	rust@persistent_cache_restore@basic-react-development	4.5 ms	5.1 ms	-12.07%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing codex/codegenerationresults (867abcc) with main (8ab773f)}

Footnotes

1. 47 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. ↩

[ahabhgk]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid poisoning codegen cache for concatenation scopes

Marking concatenation_scope as AsOption<Unsupported> makes serialization fail whenever it is Some. The ESM library concatenation-scope hook returns Some(ConcatenationScope) for scope-hoisted modules and parser/generator stores it on CodeGenerationResult, so ModulesCodegenOccasion::save will fail encoding and reset the entire modules-codegen occasion for those builds. This silently disables the new persistent codegen cache in that configuration; serialize the scope or skip only those entries instead of failing the whole artifact.

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