[docs] Document temporary IDs for issue creation and lockdown mode for GitHub tool

[github-actions]

Documentation Updates - 2025-11-25

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

1. Temporary IDs for issue creation (from Add temporary ID support for create_issue safe output #4698) - Added documentation for the new temporary_id field in create_issue safe output, enabling parent-child issue references
2. Lockdown mode for GitHub tool (from Add lockdown field to GitHub tool configuration #4659) - Added documentation for the new lockdown field in GitHub tool configuration

Changes Made

• docs/src/content/docs/reference/safe-outputs.md:

  • Added new section "Temporary IDs for Issue References" under Issue Creation
  • Documented the aw_ prefix format for temporary IDs
  • Provided JSON example showing parent-child issue creation with reference resolution
  • Explained how #aw_abc123def456 references are replaced with actual issue numbers

• docs/src/content/docs/reference/tools.md:

  • Added new "Lockdown Mode" section under GitHub Tools → Modes and Restrictions
  • Documented the lockdown: true configuration option
  • Explained security benefits for workflows processing public repository data
  • Clarified that private repositories and collaborator content remain unaffected

Merged PRs Referenced

• Add temporary ID support for create_issue safe output #4698 - Add temporary ID support for create_issue safe output
• Add lockdown field to GitHub tool configuration #4659 - Add lockdown field to GitHub tool configuration

Additional Context

Both features were merged in the last 24 hours and are user-facing enhancements that developers will benefit from knowing about. The documentation follows the Diátaxis framework (Reference format) and adheres to the project's documentation guidelines for neutral tone and concise technical descriptions.

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