chore(ci): optimise runners, distribute test shards

[carderne]

• Use bigger/smaller runners as recommended by warpbuild
• Distribute test shards more evenly, move internal tests single big shard

[changeset-bot]

⚠️ No Changeset found

Latest commit: d097505

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Walkthrough

GitHub Actions workflows were updated to use larger runners for E2E, typecheck, and Webapp unit tests, and a larger Windows runner for CLI E2E tests. Release and prerelease jobs now document their requirement for GitHub-hosted runners. Internal unit tests now execute 12 parallel local shards in one job with aggregated status and merged reports. Test timing data was regenerated.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description misses required template sections like Closes #, checklist, testing, changelog, and screenshots.	Add the template sections with an issue reference, checklist items, testing steps, a short changelog, and screenshots or mark them N/A.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the CI runner and shard distribution changes.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch warp-runners

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[devin-ai-integration]

Devin Review found 1 potential issue.