refactor: Extract console-forwarding to kernel-browser-runtime utils

[rekmarks]

Summary

Move console message forwarding functionality from the extension package to @metamask/kernel-browser-runtime as reusable utilities. This enables log capture from offscreen documents and other contexts via DuplexStream.

Changes

• Create console-forwarding utilities with types and validators in kernel-browser-runtime
• Update extension to import console-forwarding functions and types from kernel-browser-runtime
• Add new exports to kernel-browser-runtime index for:
  • ConsoleForwardMessage type
  • isConsoleForwardMessage type guard
  • makeConsoleForwardingValidator factory function
  • setupConsoleForwarding function
  • handleConsoleForwardMessage function

Benefits

• Eliminates code duplication between extension and other potential consumers
• Makes console forwarding reusable across different packages
• Enables log capture from contexts not directly accessible by Playwright (like offscreen documents)

Test Plan

• kernel-browser-runtime tests pass (including new export validation)
• extension imports work correctly
• Console forwarding still works as expected

🤖 Generated with Claude Code

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​playwright/​test@​1.54.2 ⏵ 1.57.0
	playwright@​1.54.2 ⏵ 1.57.0		+16

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[socket-security]

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Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Potential code anomaly (AI signal): npm playwright-core is 100.0% likely to have a medium risk anomaly Notes: This is a legitimate browser installation helper script that is part of Microsoft Playwright's testing framework. The script downloads and installs Microsoft Edge Dev browser packages on macOS systems. While the script does have security weaknesses (downloads packages from user-supplied URLs without integrity checks and installs them with sudo privileges), this appears to be intentional functionality for automated testing environments where the URL would be controlled and trusted. The script is not malware but rather a utility for test automation that assumes it will be used in controlled environments with trusted package sources. Confidence: 1.00 Severity: 0.60 From: ? → npm/playwright@1.57.0 → npm/playwright-core@1.57.0 ℹ Read more on: This package | This alert | What is an AI-detected potential code anomaly? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: An AI system found a low-risk anomaly in this package. It may still be fine to use, but you should check that it is safe before proceeding. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/playwright-core@1.57.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

Ignoring alerts on:

• playwright@1.57.0

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[rekmarks]

@SocketSecurity ignore npm/playwright@1.57.0