[docs] Update documentation for features from 2025-11-20

[github-actions]

Documentation Updates - November 20, 2025

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

Features Documented

• assign-milestone safe output (from Add assign-milestone safe output type #4334) - New safe output type for assigning issues to milestones

Changes Made

• Updated docs/src/content/docs/reference/safe-outputs.md:
  • Added assign-milestone to the safe outputs table
  • Added detailed configuration section for assign-milestone
  • Documented allowed list and cross-repository support

Merged PRs Referenced

• Add assign-milestone safe output type #4334 - Add assign-milestone safe output type
• Mark Claude and Codex engines as experimental #4368 - Mark Claude and Codex engines as experimental (already documented)
• [tidy] Fix formatting in bundler.go #4369 - Fix formatting in bundler.go (internal refactoring, no user-facing changes)
• Refactor: Extract duplicate log parser markdown generation to shared module #4363 - Refactor: Extract duplicate log parser markdown generation (internal refactoring, no user-facing changes)
• Fix test isolation in collect_ndjson_output.test.cjs #4365 - Fix test isolation (test-only change, no user-facing changes)
• Optimize integration tests by splitting into 5 parallel jobs #4361 - Optimize integration tests (CI-only change, no user-facing changes)
• Fix Playwright MCP integration: update --allowed-origins to --allowed-hosts #4359 - Fix Playwright MCP integration flag (internal fix, not documented in user-facing docs)
• Extract MCP initialization and errors in Codex log parser #4358 - Extract MCP initialization in Codex log parser (internal enhancement, no user-facing changes)
• Update smoke test workflows to use add-comment and add comprehensive capability testing #4352 - Update smoke test workflows (internal testing, no user-facing changes)
• Add live server integration test for Playwright MCP inspect command #4353 - Add Playwright MCP integration test (test-only change, no user-facing changes)

Notes

Most merged PRs in the last 24 hours were internal refactoring, test improvements, or CI enhancements that do not require user-facing documentation updates. The main user-facing feature that needed documentation was the new assign-milestone safe output type.

The Claude and Codex engines being marked as experimental was already documented in the engines.md file (lines 10-12), so no additional changes were needed for that feature.

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