docs: add TASK-003 discovery workflow

TASKS.md

@@ -29,6 +29,7 @@ Status: Done
 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
@@ -36,3 +37,26 @@ Acceptance Criteria:
 - The prompt includes validation instructions
 - The prompt includes reporting instructions
 - Add or update tests
+
+## TASK-003 — Improve discovery workflow
+
+Status: Todo
+
+Goal:
+Improve `rdb discover` so it records structured answers into the discovery ledger.
+
+Acceptance Criteria:
+
+- Ask the 10 core discovery questions
+- Record:
+  - Question
+  - Answer
+  - Confidence
+  - Follow-up needed
+  - Linked decision
+  - Linked task
+  - Date
+- Append answers safely
+- Preserve existing discovery history
+- Add/update tests
+- Update RUN_LOG.md