feat: make PR review automation agent-agnostic

[AnrokX]

Summary

• Added agent-agnostic PR review automation support in both automation service and queue/manual launcher flows.
• Wired reviewer spawn/feedback to preserve selected agent session identity (Claude or Codex) and added session tracking for precise feedback routing.
• Added configurable Codex/Claude reviewer options to defaults and documentation.
• Updated Queue panel actions to spawn review/fix/overnight/recheck agents using the configured task launch agent preference.

Files

• client/app.js
• server/prReviewAutomationService.js
• user-settings.default.json
• CODEBASE_DOCUMENTATION.md

Notes

• Reviewer selection now includes both -claude and -codex sessions and labels messages by actual agent.
• PR automation config now supports:
  • reviewerAgent, reviewerMode, reviewerProvider
  • reviewerSkipPermissions (Claude)
  • reviewerCodexModel, reviewerCodexReasoning, reviewerCodexVerbosity, reviewerCodexFlags (Codex)