docs: add task for agent prompt generation

TASKS.md

@@ -21,3 +21,18 @@ Acceptance Criteria:
 Status: Done
 
 Goal: Create the command that initialises the standard RDB project structure.
+
+## TASK-002 — Generate agent prompts
+
+Status: Todo
+
+Goal: Add a command that generates a ready-to-paste implementation prompt for the next Todo task.
+
+Acceptance Criteria:
+- `rdb prompt` reads the next Todo task from TASKS.md
+- The prompt tells the agent to read README.md, TASKS.md, PROJECT_STATE.md, AGENT_HANDOFF.md, and context/agent-guidelines.md
+- The prompt says to implement one task only
+- The prompt includes the task title, status, goal, and acceptance criteria
+- The prompt includes validation instructions
+- The prompt includes reporting instructions
+- Add or update tests