Add Captain custom tools with REST API and account-scoped listing

Add Captain custom tools with REST API and account-scoped listing: a task in bird-critic-1.5-full-300 (Harbor dataset). This task adds support for custom HTTP tools that Captain agents can invoke. The graded surface is a single controller: the Captain custom tools controller at…

The task

This task adds support for custom HTTP tools that Captain agents can invoke. The graded surface is a single controller: the Captain custom tools controller at `enterprise/app/controllers/api/v1/accounts/captain/custom_tools_controller.rb`. The index action must return all custom tools for the account, including…

Part of kochsnow/bird-critic-1.5-full-300.