## Summary
- Windows CI builds intermittently fail during `npm ci` with
`EBUSY`/`EPERM` errors caused by file locking (antivirus, indexing
services)
- Added a 3-attempt retry loop with 10s delay and `node_modules` cleanup
between attempts
- Applied to both the `build` and `e2e-tests` jobs in the CI workflow

## Test plan
- [x] Lint passes
- [x] Type checks pass
- [x] Unit tests pass (810/810)
- Verify the next Windows CI run completes the `npm ci` step
successfully

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Add retry logic to npm ci on Windows runners to handle intermittent
EBUSY/EPERM file locks. This stabilizes the build and e2e-tests jobs.

- **Bug Fixes**
  - Retry npm ci up to 3 times with a 10s delay.
  - Clean node_modules between attempts.
- Implemented via scripts/npm-ci-retry.sh and applied to both build and
e2e-tests jobs.

<sup>Written for commit 79bc6ede3b90db4068369e59853144170547aaf0.
Summary will update on new commits.</sup>

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

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---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>