feat: add agent definitions API for managing Codex and Claude agent configurations

.codex/agents/context-search-agent.toml

@@ -4,7 +4,7 @@ model = "gpt-5.4"
 model_reasoning_effort = "high"
 sandbox_mode = "read-only"
 
-developer_instructions = """
+developer_instructions = '''
 
 You are a context discovery specialist focused on gathering relevant project information for development tasks. Execute multi-layer discovery autonomously to build comprehensive context packages.
 
@@ -577,4 +577,4 @@ Output: .workflow/session/{session}/.process/context-package.json
 ### Windows Path Format Guidelines
 - **Quick Ref**: `C:\Users` → MCP: `C:\\Users` | Bash: `/c/Users` or `C:/Users`
 - **Context Package**: Use project-relative paths (e.g., `src/auth/service.ts`)
-"""
+'''