fix: preserve cache error class names in save-cache bundle (#1093)

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## Summary

- Preserve class names in the save-cache bundle so `@actions/cache`
error-name comparisons distinguish validation errors, benign
cache-reservation races, and finalization errors correctly.
- Add regression coverage that exercises the bundled `ValidationError`,
`ReserveCacheError`, and `FinalizeCacheError` constructors.

Fixes #1028

## Verification

- `npm run all` passed on Ubuntu 24.04 with Node 24.19.0: build, Biome,
packaging, and all 159 tests across 15 suites.
- `git diff --check` passed.

The save-cache bundle increases by about 77 KB raw (14 KB gzip) to
preserve the required names.

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Danny Ward authored and GitHub committed 2026-10-15 14:57:07 +02:00

1 parent 8ca4be000b

commit c97f06e356

3 files changed

+2567 -720

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dist/save-cache/index.cjs

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