refactor: e2e script cleanup

[DanielSinclair]

What changed

• Created a unified E2E test runner script (e2e.sh) that replaces multiple separate scripts
• Added support for headless/headed browser testing with HEADLESS_MODE environment variable (on by default)
• Updated all E2E test commands in package.json to use the new unified script
• Improved test path handling to allow running specific test files or directories
• Updated GitHub workflows to use the new E2E commands
• Enhanced documentation in README.md and CLAUDE.md with clearer E2E test instructions
• Added better chain configuration handling for different test environments

What to test

• Run E2E tests with the new commands:
  • yarn e2e - runs all tests in headless mode
  • yarn e2e:headed - runs tests with visible browser
  • yarn e2e serial/send/1_sendFlow.test.ts - runs a specific test file
  • yarn e2e ./e2e/parallel/ - runs all tests in a directory
• Verify that the specialized test commands still work:
  • yarn e2e:parallel
  • yarn e2e:swap
  • yarn e2e:send
  • yarn e2e:send:optimism
  • yarn e2e:dappInteractions
• Check that the GitHub workflows execute correctly with the updated commands

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PR-Codex overview

This PR focuses on restructuring end-to-end (E2E) testing scripts, enhancing the functionality and clarity of E2E tests while removing outdated scripts.

Detailed summary

• Deleted legacy E2E test scripts: scripts/e2e-serial-tests.sh, scripts/e2e-parallel-tests.sh, scripts/e2e-op-serial-tests.sh.
• Updated README.md to reflect new E2E test commands and options.
• Modified .github/workflows/claude-review.yml to adjust disallowed tools.
• Enhanced e2e/helpers.ts to support headless mode for Firefox and Chrome.
• Updated package.json to replace old scripts with a unified ./scripts/e2e.sh script for E2E tests.
• Added a new scripts/e2e.sh script that consolidates E2E test execution with options for parallel and serial tests.
• Adjusted .github/workflows/build.yml to use new E2E commands instead of deprecated vitest commands.

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[DanielSinclair]

• #2012 👈 (View in Graphite)
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