# Phase 4 Plan: Progression

**Status:** Ready for execution
**Phase Goal:** Show evidence-backed readiness and select the next challenge.

## Requirements Covered

- PROG-01: User can see a role-specific readiness map.
- PROG-02: Concepts have challenge ladders from definition to interview
  pressure.
- PROG-03: System selects next challenge based on learner memory and grading
  evidence.
- PROG-04: System unlocks boss-style integrated questions after prerequisite
  stability.
- PROG-05: Streaks and rewards avoid punitive or gambling-like mechanics.

## Tasks

### 1. Add progression package

- Define readiness map, concept progress, reward, and unlock types.
- Compute readiness from learner memory snapshots.

### 2. Add next challenge selection

- Select the weakest evidenced concept first.
- Use review schedule or misconception evidence to choose recovery difficulty.
- Produce typed `workflows.NextChallenge`.

### 3. Add HTTP endpoints

- `GET /api/v1/learners/{userID}/readiness-map`
- `GET /api/v1/learners/{userID}/next-challenge`

### 4. Add tests and verification

- Test readiness map projection.
- Test next challenge selection from weak memory.
- Test HTTP readiness flow after diagnostic answer.
- Run Go tests, OpenSpec validation, line-count check, and smoke.

## Out of Scope

- Frontend visualization.
- Persistent streak history.
- Multi-track progression graph.