adds e2e workflow

[gtrrz-victor]

No description provided.

[cursor]

PR Summary

Low Risk
Low risk CI-only change; main considerations are external CLI install via curl | bash and reliance on a repo secret for workflow execution.

Overview
Adds a new GitHub Actions workflow (.github/workflows/e2e.yml) to run E2E tests on pushes to main and via manual dispatch.

The job enforces single-run concurrency, sets a 10-minute timeout, installs the Claude CLI, and runs mise run test:e2e:claude using the CLAUDE_CODE_OAUTH_TOKEN secret.

^{Written by Cursor Bugbot for commit ea15c5f. Configure here.}

[Copilot]

Pull request overview

Adds a dedicated GitHub Actions workflow to run end-to-end (E2E) tests against the main branch (and via manual dispatch), aligning with the repo’s use of mise tasks for CI automation.

Changes:

• Introduces a new E2E Tests workflow triggered on push to main and workflow_dispatch.
• Adds concurrency controls to ensure only one E2E run executes at a time.
• Installs and verifies the Claude CLI, then runs mise run test:e2e:claude with an OAuth token secret.