## Summary
- Update CI workflow to use 2 E2E test shards instead of 1 for
self-hosted Mac mini runners (privileged authors)
- This improves E2E test parallelism on self-hosted infrastructure

## Test plan
- CI should run with 2 shards on self-hosted runners for privileged
authors
- Non-privileged authors still get 4 shards on GitHub-hosted runners
(unchanged)

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Run E2E tests in 2 shards on self-hosted Mac mini (macOS ARM64) runners
for privileged authors to improve parallelism and speed up CI.
Non-privileged authors remain on GitHub-hosted runners with 4 shards;
other CI settings are unchanged.

<sup>Written for commit 972f36eb853a620a3f08ac2089d725768177beb7.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk workflow-only change; main impact is CI execution behavior
(more parallel shards) and potential shard/merge configuration issues if
assumptions about 1 shard were relied on.
> 
> **Overview**
> In `.github/workflows/ci.yml`, increases **self-hosted
privileged-author** Playwright E2E parallelism by changing the matrix
from `1/1` to `2` shards (`e2e_shard=[1,2]`, `e2e_shard_total=[2]`).
> 
> GitHub-hosted macOS/Windows runs remain at `4` shards, and build/job
wiring is otherwise unchanged.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
972f36eb853a620a3f08ac2089d725768177beb7. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>