/iblai-vibe-agent-grader

Add the agent Grader tab -- set up how the agent grades work against a rubric you define. A master "Grading" toggle attaches/detaches the Grading tool on the agent and gates three sub-tabs: Grading setup (what gets graded, how much feedback is shared, and the required grading instructions), Rubric (a criteria table with modal-based add/edit/delete and a running points total), and Results (every grade the agent has issued, with human overrides that are pushed back to the LMS the grade came from). Great for essays, projects, and practice exercises. This is one tab in the wider agent-settings family. All tabs share the same AgentSettingsProvider wrapper.