<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Medium Risk**
> Moderate risk because it changes CI execution order and artifact
handling across macOS/Windows, which could cause failures or masking of
build/test issues if artifacts are incomplete or OS-specific metadata
isn’t preserved.
> 
> **Overview**
> Refactors the CI workflow to run a single per-OS `build` job
(including `pre:e2e` and fake server build) and then execute Playwright
`e2e-tests` in 4 shards that **download the built artifacts** instead of
rebuilding per shard.
> 
> Adds OS-specific artifact packaging: macOS bundles are tarred
(`out-macos.tar`) to preserve app metadata, while Windows uploads `out/`
directly; `merge-reports` is updated to depend on `e2e-tests` rather
than the old `test` job.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
2f42db63302827878905a8225fd47fc7b6cf1972. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

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---------
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>