🔒 Enable GitHub Lockdown Mode Security Feature by default in public repos

[dsyme]

Summary

• Enable lockdown mode by default in public repos
• Added comprehensive documentation for GitHub Lockdown Mode security feature
• Created new reference page explaining lockdown mode configuration and use cases
• Updated architecture and FAQ pages with lockdown mode details

Key Changes

• Introduced detailed documentation in lockdown-mode.md explaining:
  • Security benefits of lockdown mode
  • When to enable/disable lockdown
  • Configuration options
  • Safe workflow design patterns
• Updated architecture.mdx with lockdown mode overview and security table
• Enhanced FAQ with lockdown mode explanation and use cases
• Added troubleshooting guidance for lockdown mode issues

Security Considerations

Lockdown mode provides an additional layer of protection for public repositories by filtering content from untrusted sources, helping prevent potential security risks in automated workflows.

[Copilot]

Pull request overview

This PR adds comprehensive documentation for the GitHub Lockdown Mode security feature, which filters public repository content to only show issues, PRs, and comments from users with push access. This protects agentic workflows from processing potentially malicious or misleading input from untrusted users in public repositories.

Changes:

• Created detailed reference documentation explaining lockdown mode security benefits, configuration, and use cases
• Integrated lockdown mode information into architecture documentation and security layers table
• Added FAQ entry and troubleshooting guidance for lockdown mode access issues

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/src/content/docs/reference/lockdown-mode.md	New comprehensive reference page documenting lockdown mode features, security benefits, configuration options, safe use cases, and when to keep it enabled
docs/src/content/docs/reference/tools.md	Updated GitHub tools section with concise lockdown mode description and link to full documentation
docs/src/content/docs/reference/faq.md	Added FAQ entry explaining what lockdown mode is and when it's enabled
docs/src/content/docs/troubleshooting/common-issues.md	Added troubleshooting section for lockdown mode blocking expected content with symptoms, causes, and solutions
docs/src/content/docs/introduction/architecture.mdx	Added lockdown mode section to security architecture overview and added entry to security layers table

Comments suppressed due to low confidence (1)

docs/src/content/docs/reference/lockdown-mode.md:201

• Incorrect field name in safe-outputs configuration. The field should be allowed, not labels. According to the safe-outputs documentation, add-labels uses allowed to restrict to specific labels. The correct syntax is:

safe-outputs:
  add-labels:
    allowed: ["spam", "needs-review"]

  add-labels:
    labels: ["spam", "needs-review"]

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