E-Commerce Cart

🏗️ @arch responds with a scoring matrix:

## /agile-explore-brainstorm — Results

### Problem Statement
E-commerce cart system with catalog, cart, checkout, payments.
Constraints: maintainable across 3 sprints, clear module boundaries,
testable in isolation.

### Scoring Matrix

| Approach             | Feasibility | Maintainability | Performance | Risk | Total |
|----------------------|------------|-----------------|-------------|------|-------|
| Monolith (single module) | 9/10   | 5/10            | 8/10        | 7/10 | 29    |
| Modular Monolith     | 8/10       | 9/10            | 8/10        | 8/10 | 33    |
| Microservices        | 5/10       | 9/10            | 7/10        | 4/10 | 25    |

### Recommendation
Modular Monolith — clear module boundaries (catalog, cart, checkout,
payment) but single deployable. Best balance of maintainability and
complexity for a solo developer.

### What Would Change This
- If team has 4+ devs → consider microservices
- If prototype/throwaway → plain monolith is fine
- If each module scales independently → microservices

🗄️ @dba designs the schema:

## Initial Schema Design

### Tables

products
  id          INTEGER PRIMARY KEY
  name        TEXT NOT NULL
  description TEXT
  price       DECIMAL(10,2) NOT NULL
  stock       INTEGER NOT NULL DEFAULT 0
  category    TEXT
  created_at  DATETIME DEFAULT CURRENT_TIMESTAMP

carts
  id          INTEGER PRIMARY KEY
  session_id  TEXT UNIQUE NOT NULL
  created_at  DATETIME DEFAULT CURRENT_TIMESTAMP
  updated_at  DATETIME DEFAULT CURRENT_TIMESTAMP

cart_items
  id          INTEGER PRIMARY KEY
  cart_id     INTEGER NOT NULL → carts(id) ON DELETE CASCADE
  product_id  INTEGER NOT NULL → products(id)
  quantity    INTEGER NOT NULL DEFAULT 1
  UNIQUE(cart_id, product_id)

orders
  id          INTEGER PRIMARY KEY
  cart_id     INTEGER NOT NULL → carts(id)
  status      TEXT NOT NULL DEFAULT 'pending'
  total       DECIMAL(10,2) NOT NULL
  shipping_address TEXT NOT NULL
  created_at  DATETIME DEFAULT CURRENT_TIMESTAMP

order_items
  id          INTEGER PRIMARY KEY
  order_id    INTEGER NOT NULL → orders(id) ON DELETE CASCADE
  product_id  INTEGER NOT NULL → products(id)
  quantity    INTEGER NOT NULL
  unit_price  DECIMAL(10,2) NOT NULL

### Indexes
- idx_products_category ON products(category)
- idx_cart_items_cart ON cart_items(cart_id)
- idx_orders_status ON orders(status)

/agile-setup-init       → Memory populated (project, architecture, conventions)
/agile-setup-onboard    → Coding rules generated from detected conventions
/agile-setup-health     → ✅ All checks pass

📋 @po responds:

## /agile-story-create — Story Created

### Story US-001
**As a** store administrator,
**I want** to create, read, update, and delete products,
**so that** I can manage the product catalog.

### Acceptance Criteria

**AC-1: Create product with all fields**
- **Given** the API is running
- **When** I send POST /products with name, description, price,
  stock, and category
- **Then** I receive 201 with the created product including an ID

**AC-2: Validation — missing required fields**
- **Given** the API is running
- **When** I send POST /products without name or price
- **Then** I receive 400 with specific validation errors

**AC-3: Update product**
- **Given** a product exists with ID 1
- **When** I send PUT /products/1 with updated fields
- **Then** I receive 200 with the updated product

**AC-4: Delete product**
- **Given** a product exists with ID 1
- **When** I send DELETE /products/1
- **Then** I receive 204 and the product is removed

### INVEST Check: ✅ All criteria pass
### Metadata: 3 points | Status: Unrefined

💬 /agile-story-create I need to search products by name
   and filter by category. Support pagination for large catalogs.

   → 📋 @po creates US-002: "Search and filter products" — 5 pts

💬 /agile-story-create I need to organize products into
   categories and list all available categories.

   → 📋 @po creates US-003: "Product categories" — 2 pts

🔄 @sm facilitates:

## Sprint Planning Output

### Sprint Goal
"Deliver a working product catalog with CRUD, search, and categories"

### Sprint Backlog
| Story  | Title                   | Points | Priority |
|--------|-------------------------|--------|----------|
| US-001 | Product CRUD            | 3      | P1       |
| US-002 | Search and filter       | 5      | P1       |
| US-003 | Product categories      | 2      | P2       |

### Capacity Check
- Team velocity (first sprint): 10 points (conservative)
- Committed this sprint: 10 points
- Capacity utilization: 100%

US-001: Product CRUD (3 pts)

/agile-code-branch feature US-001 product-crud
/agile-story-plan US-001
/agile-code-tdd US-001
  🔴 Test: POST /products creates product → ❌
  🟢 Implement create handler with validation → ✅
  🔴 Test: POST /products without name returns 400 → ❌
  🟢 Add field validation → ✅
  🔴 Test: PUT /products/:id updates product → ❌
  🟢 Implement update handler → ✅
  🔴 Test: DELETE /products/:id removes product → ❌
  🟢 Implement delete handler → ✅
/agile-code-ci           → ✅ All green (8/8 tests passing)
/agile-code-commit       → feat(catalog): add product CRUD endpoints
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved (🟡 S2: extract validation to middleware)
/agile-code-merge        → Squash merged to develop
/agile-story-dod         → ✅ DONE
/agile-story-accept      → ✅ ACCEPTED (3 points)

US-002: Search and filter products (5 pts)

/agile-code-branch feature US-002 product-search
/agile-story-plan US-002
/agile-code-tdd US-002
  🔴 Test: GET /products?q=shirt returns matching products → ❌
  🟢 Implement text search with LIKE query → ✅
  🔴 Test: GET /products?category=electronics filters → ❌
  🟢 Add category filter to query builder → ✅
  🔴 Test: GET /products?page=2&limit=10 paginates → ❌
  🟢 Add pagination with offset/limit → ✅
/agile-code-ci           → ✅ All green
/agile-code-commit       → feat(catalog): add product search, filter, pagination
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved
/agile-code-merge        → Squash merged to develop
/agile-story-dod         → ✅ DONE
/agile-story-accept      → ✅ ACCEPTED (5 points)

US-003: Product categories (2 pts)

/agile-code-branch feature US-003 categories
/agile-story-plan US-003
/agile-code-tdd US-003
  🔴 Test: GET /categories returns distinct categories → ❌
  🟢 Implement categories endpoint → ✅
  🔴 Test: GET /products?category=shoes filters correctly → ❌
  🟢 Verify integration with search filter → ✅
/agile-code-ci           → ✅ All green
/agile-code-commit       → feat(catalog): add category listing endpoint
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved
/agile-code-merge        → Squash merged to develop
/agile-story-dod         → ✅ DONE
/agile-story-accept      → ✅ ACCEPTED (2 points)

/agile-sprint-review
  Sprint Goal: "Deliver a working product catalog" → ✅ Met
  Velocity: 10/10 points (100%)
  All 3 stories accepted.

/agile-sprint-retro
  What went well: clean module boundaries from day 1
  What to improve: need shared validation middleware
  Action: extract common validation before Sprint 2

/agile-memory-learn
  → Sprint 1 velocity baseline: 10 points

📋 @po responds:

## /agile-story-create — Story Created

### Story US-007
**As a** shopper,
**I want** to add items to my cart, manage quantities, validate
stock, calculate totals with tax, enter my shipping address,
and process payment,
**so that** I can purchase products from the store.

### Acceptance Criteria
AC-1: Add product to cart
AC-2: Update item quantity in cart
AC-3: Remove item from cart
AC-4: Validate stock availability before checkout
AC-5: Calculate total with tax
AC-6: Collect and validate shipping address
AC-7: Process payment and create order
AC-8: Reduce stock after successful payment
AC-9: Handle payment failure gracefully

### INVEST Check
| Criterion   | Status |
|-------------|--------|
| Independent | ✅     |
| Negotiable  | ✅     |
| Valuable    | ✅     |
| Estimable   | ⚠️     |
| Small       | ❌ FAIL |
| Testable    | ✅     |

### Metadata
- **Estimate**: 21 points
- **Status**: Unrefined
- ⚠️ WARNING: This story violates the "Small" criterion.
  21 points is too large for a single sprint.

📋 @po responds:

## /agile-story-split — Results

### Strategy: workflow-steps
Split along the user's natural workflow through checkout.

### Original Story
US-007: Complete checkout flow — 21 points ❌ Too large

### Split Into

**US-007a: Cart management (add/remove/update quantities)**
- **As a** shopper, **I want** to add products to my cart,
  update quantities, and remove items,
  **so that** I can build my order before checking out.
- ACs: add item, update quantity, remove item, view cart
- **Estimate**: 5 points

**US-007b: Stock validation (check availability before checkout)**
- **As a** shopper, **I want** the system to verify items are
  in stock before I proceed to checkout,
  **so that** I don't pay for unavailable products.
- ACs: block checkout if out of stock, show availability warning
- **Estimate**: 3 points

**US-007c: Checkout form (shipping address, total with tax)**
- **As a** shopper, **I want** to enter my shipping address
  and see the order total including tax,
  **so that** I know exactly what I'm paying before confirming.
- ACs: address form validation, tax calculation, order summary
- **Estimate**: 5 points

**US-007d: Payment processing (charge card, create order)**
- **As a** shopper, **I want** to submit payment and receive
  an order confirmation,
  **so that** my purchase is completed.
- ACs: process payment, create order record, reduce stock,
  handle payment failure
- **Estimate**: 5 points

### INVEST Validation (each sub-story)
| Story   | I  | N  | V  | E  | S  | T  |
|---------|----|----|----|----|----|----|
| US-007a | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| US-007b | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| US-007c | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| US-007d | ✅ | ✅ | ✅ | ✅ | ⚠️ | ✅ |

### Note on US-007d
US-007d includes payment processing AND stock reduction AND
error handling — still 5 points but at the upper boundary.
Consider splitting further if complexity grows during
implementation.

🔄 @sm facilitates:

## Sprint Planning Output

### Sprint Goal
"Deliver cart management and checkout — from add-to-cart to payment"

### Sprint Backlog
| Story   | Title                         | Points | Priority |
|---------|-------------------------------|--------|----------|
| US-007a | Cart management               | 5      | P1       |
| US-007b | Stock validation              | 3      | P1       |
| US-007c | Checkout form + tax           | 5      | P1       |
| US-007d | Payment processing            | 5      | P2       |

### Capacity Check
- Historical velocity: 10 points (Sprint 1)
- Committed this sprint: 18 points
- Capacity utilization: 180% ⚠️ OVER-COMMITTED

### Risk Mitigation
- US-007d marked P2 — can be deferred to Sprint 3 if needed
- Core flow (US-007a → US-007c) is 13 points — within reach

🗄️ @dba validates schema for cart module:

cart_items table:
  - cart_id FK → carts(id) ON DELETE CASCADE
  - product_id FK → products(id) — no cascade (preserve history)
  - UNIQUE(cart_id, product_id) — prevents duplicate entries
  - quantity CHECK(quantity > 0) — no zero-quantity items

Index: idx_cart_items_cart_product ON cart_items(cart_id, product_id)
→ Covers the most common query pattern

/agile-code-branch feature US-007a cart-management
/agile-story-plan US-007a
/agile-code-tdd US-007a
  🔴 Test: POST /cart/items adds product to cart → ❌
  🟢 Implement add-to-cart with cart creation → ✅
  🔴 Test: PUT /cart/items/:id updates quantity → ❌
  🟢 Implement quantity update → ✅
  🔴 Test: DELETE /cart/items/:id removes item → ❌
  🟢 Implement remove from cart → ✅
  🔴 Test: GET /cart returns all items with subtotals → ❌
  🟢 Implement cart summary with price calculation → ✅
/agile-code-ci           → ✅ All green (12/12 tests)
/agile-code-commit       → feat(cart): add cart management endpoints
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved
/agile-code-merge        → Squash merged to develop
/agile-story-dod         → ✅ DONE
/agile-story-accept      → ✅ ACCEPTED (5 points)

🔄 @sm responds:

## /agile-sprint-status — Sprint 2 Dashboard

### Burndown
Day 1: ██████████████████ 18 pts remaining
Day 2: █████████████ 13 pts remaining  (US-007a done)
Day 3: ██████████ 10 pts remaining     ← YOU ARE HERE

### Stories by Status
| Story   | Title                  | Points | Status       |
|---------|------------------------|--------|--------------|
| US-007a | Cart management        | 5      | ✅ Accepted   |
| US-007b | Stock validation       | 3      | 🔨 In Progress|
| US-007c | Checkout form + tax    | 5      | 📋 To Do     |
| US-007d | Payment processing     | 5      | 📋 To Do     |

### Velocity Tracking
- Completed: 5/18 points (28%)
- Sprint progress: 50% of time elapsed
- Projected: ~14 points by sprint end

### Blockers
⚠️ US-007d at risk — may not fit in this sprint.
   Recommendation: focus on US-007b and US-007c first.
   Defer US-007d to Sprint 3 if needed.

US-007b: Stock validation (3 pts)

/agile-code-branch feature US-007b stock-validation
/agile-story-plan US-007b
/agile-code-tdd US-007b
  🔴 Test: checkout blocked when item out of stock → ❌
  🟢 Add stock check before checkout proceeds → ✅
  🔴 Test: warning shown when stock is low → ❌
  🟢 Add low-stock threshold check → ✅
/agile-code-ci           → ✅ All green
/agile-code-commit       → feat(cart): add stock validation on checkout
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved
/agile-code-merge        → Squash merged to develop
/agile-story-dod         → ✅ DONE
/agile-story-accept      → ✅ ACCEPTED (3 points)

US-007c: Checkout form + tax calculation (5 pts)

/agile-code-branch feature US-007c checkout-form
/agile-story-plan US-007c
/agile-code-tdd US-007c
  🔴 Test: POST /checkout validates shipping address → ❌
  🟢 Add address validation (required fields) → ✅
  🔴 Test: checkout calculates tax correctly → ❌
  🟢 Implement tax calculation by region → ✅
  🔴 Test: order summary shows items + tax + total → ❌
  🟢 Build order summary endpoint → ✅
/agile-code-ci           → ✅ All green
/agile-code-commit       → feat(checkout): add checkout form with tax calculation
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved
  (🟡 S2: tax rates should come from config, not hardcoded)
/agile-code-merge        → Squash merged to develop
/agile-story-dod         → ✅ DONE
/agile-story-accept      → ✅ ACCEPTED (5 points)

US-007d: Payment processing (5 pts) — deferred

🔄 @sm: US-007d deferred to Sprint 3.
  Sprint 2 committed 18 points but velocity is 10.
  Core checkout flow (US-007a–c) complete at 13 points.
  Payment processing moves to Sprint 3 alongside security work.

## Sprint Review Report

### Sprint Goal: "Deliver cart management and checkout"
### Sprint Goal Met: ⚠️ Partial — cart + checkout delivered,
                        payment deferred to Sprint 3

| Story   | Title                  | Points | Status      |
|---------|------------------------|--------|-------------|
| US-007a | Cart management        | 5      | ✅ Accepted  |
| US-007b | Stock validation       | 3      | ✅ Accepted  |
| US-007c | Checkout form + tax    | 5      | ✅ Accepted  |
| US-007d | Payment processing     | 5      | ⏳ Deferred  |

### Velocity
- Committed: 18 points
- Completed: 13 points (72%)
- Running average: (10 + 13) / 2 = 11.5 points

/agile-sprint-retro
  What went well: story splitting prevented a 21-point disaster
  What to improve: over-committed by 80% — use velocity data
  Action: Sprint 3 commit to ≤12 points

/agile-memory-learn
  → Sprint 2 velocity: 13 points
  → Lesson: workflow-steps splitting worked well for checkout

/agile-code-branch feature US-007d payment-processing
/agile-story-plan US-007d
/agile-code-tdd US-007d
  🔴 Test: POST /checkout/pay processes payment → ❌
  🟢 Implement payment gateway integration → ✅
  🔴 Test: successful payment creates order record → ❌
  🟢 Create order + order_items on success → ✅
  🔴 Test: successful payment reduces stock → ❌
  🟢 Decrement product stock after payment → ✅
  🔴 Test: payment failure returns error, no order created → ❌
  🟢 Add transaction rollback on failure → ✅
/agile-code-ci           → ✅ All green (24/24 tests)
/agile-code-commit       → feat(payment): add payment processing with order creation
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved
/agile-code-merge        → Squash merged to develop
/agile-story-dod         → ✅ DONE
/agile-story-accept      → ✅ ACCEPTED (5 points)

🛡️ @sec responds:

## /agile-security-threat-model — STRIDE Analysis

### Scope: Checkout and Payment Flow
Components analyzed: cart → stock validation → checkout form →
payment processing → order creation

### STRIDE Threat Table

| Category             | Threat                        | Risk   | Mitigation                      |
|----------------------|-------------------------------|--------|---------------------------------|
| **S**poofing         | Fake user places order        | 🟠 Med | Session validation, CSRF tokens |
|                      | with someone else's cart       |        |                                 |
| **T**ampering        | Price manipulated client-side | 🔴 High| Server-side price calculation   |
|                      | before payment submission      |        |                                 |
| **R**epudiation      | User denies placing order     | 🟡 Low | Audit log with timestamps       |
| **I**nfo Disclosure  | Payment data leaked in logs   | 🔴 High| Never log card numbers,         |
|                      | or error messages              |        | mask in responses               |
| **D**enial of Service| Cart bombing — thousands      | 🟠 Med | Rate limiting on cart/checkout   |
|                      | of items added via script      |        | endpoints                       |
| **E**levation of     | Regular user accesses admin   | 🟠 Med | Role-based access control on    |
| Privilege            | product management endpoints   |        | product CRUD                    |

### Priority Actions
1. 🔴 Verify price is calculated server-side (not from client)
2. 🔴 Ensure payment data is never logged
3. 🟠 Add rate limiting to checkout endpoints
4. 🟠 Implement CSRF protection
5. 🟡 Add audit logging for orders

🛡️ @sec responds:

## /agile-security-audit — OWASP Top 10 Scan

### Scope: src/modules/checkout/, src/modules/payment/

### Findings

🔴 S0 — CRITICAL: Price calculated client-side
  File: src/modules/checkout/checkoutHandler.js:42
  Issue: Total is taken from request body (req.body.total)
         instead of calculated from cart_items × product prices.
  Risk: Attacker can submit total: 0.01 for a $500 order.
  Fix: Calculate total server-side from DB prices. Never trust
       client-submitted totals.
  OWASP: A04 — Insecure Design

🟠 S1 — HIGH: SQL injection in product search
  File: src/modules/catalog/searchHandler.js:18
  Issue: Query uses string concatenation:
         `WHERE name LIKE '%${req.query.q}%'`
  Risk: Attacker can extract or modify database contents.
  Fix: Use parameterized queries:
       `WHERE name LIKE ?` with `%${q}%` as parameter.
  OWASP: A03 — Injection

🟡 S2 — MEDIUM: No rate limiting on checkout endpoint
  File: src/modules/checkout/routes.js
  Issue: POST /checkout has no rate limiting.
  Risk: Automated scripts can spam checkout attempts.
  Fix: Add express-rate-limit middleware (e.g., 5 req/min).
  OWASP: A05 — Security Misconfiguration

### Summary
| Severity | Count | Action Required         |
|----------|-------|-------------------------|
| 🔴 S0   | 1     | MUST FIX before release |
| 🟠 S1   | 1     | MUST FIX before release |
| 🟡 S2   | 1     | Should fix              |
| 🔵 S3   | 0     | —                       |

### Verdict: ❌ BLOCKED — 2 critical/high findings must be fixed

Fix S0: Server-side price calculation

🔴 RED — Write test that exploits the vulnerability
test('POST /checkout/pay ignores client-submitted total', async () => {
  // Add item worth $50.00 to cart
  await addToCart(cart.id, product.id, 1);

  const res = await request(app)
    .post('/checkout/pay')
    .send({ total: 0.01, shippingAddress: validAddress });

  // Should charge $50.00 + tax, NOT $0.01
  expect(res.body.total).toBeCloseTo(53.50); // $50 + 7% tax
});

// Result: ❌ FAIL — currently accepts client total of $0.01

🟢 GREEN — Calculate total server-side
// checkoutHandler.js — FIXED
const cartItems = db.getCartItems(cartId);
const subtotal = cartItems.reduce(
  (sum, item) => sum + (item.price * item.quantity), 0
);
const tax = subtotal * TAX_RATE;
const total = subtotal + tax;
// NEVER use req.body.total

// Result: ✅ PASS — attacker's $0.01 is ignored

Fix S1: Parameterized queries

🔴 RED — Write test that attempts SQL injection
test('GET /products?q= handles SQL injection safely', async () => {
  const res = await request(app)
    .get("/products?q=' OR 1=1 --");

  expect(res.status).toBe(200);
  expect(res.body.length).toBe(0); // No results, not all rows
});

// Result: ❌ FAIL — returns ALL products (injection works!)

🟢 GREEN — Switch to parameterized query
// searchHandler.js — FIXED
const products = db.prepare(
  'SELECT * FROM products WHERE name LIKE ?'
).all(`%${q}%`);

// Result: ✅ PASS — injection attempt returns empty results

/agile-code-ci           → ✅ All green (28/28 tests)
/agile-code-commit       → fix(security): server-side pricing, parameterized queries
/agile-code-pr           → PR created
/agile-code-pr-review    → ✅ Approved by 👨‍💻 @lead and 🛡️ @sec

🛡️ @sec: Re-audit Results

| Finding | Previous | Current | Status     |
|---------|----------|---------|------------|
| S0      | 🔴 Open  | ✅ Fixed | Server-side pricing verified |
| S1      | 🟠 Open  | ✅ Fixed | Parameterized queries confirmed |
| S2      | 🟡 Open  | 🟡 Open | Rate limiting — deferred to backlog |

### Verdict: ✅ PASSED — No S0/S1 findings remaining

⌨️ @dev responds:

## /agile-code-refactor — Tidy First Analysis

### Current State
src/modules/checkout/checkoutHandler.js — 400 lines
Responsibilities: cart logic, validation, tax calculation,
payment processing, order creation, stock management

### Violations
- Single Responsibility: 6 concerns in one file
- God Object: handler knows about cart, products, orders,
  payments, tax, AND stock
- Hard to test: each test needs full checkout context

### Refactoring Plan (Tidy First)

Step 1: Extract CartService
  → addItem(), removeItem(), getCart(), calculateSubtotal()
  → 85 lines extracted

Step 2: Extract CheckoutValidator
  → validateStock(), validateAddress(), validateCart()
  → 60 lines extracted

Step 3: Extract PaymentGateway
  → processPayment(), handleFailure(), createRefund()
  → 70 lines extracted

### Before/After Metrics
| Metric                | Before | After  |
|-----------------------|--------|--------|
| Largest file (lines)  | 400    | 120    |
| Number of modules     | 1      | 4      |
| Avg cyclomatic complexity | 12 | 4      |
| Test isolation         | Poor   | Strong |

All existing tests pass after refactoring ✅
No behavior changes — purely structural improvement.

🏗️ @arch responds:

## /agile-explore-audit — Architecture Health Report

### Module Coupling Analysis
| Module     | Dependencies            | Coupling |
|------------|-------------------------|----------|
| catalog    | (none — independent)    | ✅ Low    |
| cart       | catalog (reads prices)  | ✅ Low    |
| checkout   | cart, catalog           | 🟡 Medium|
| payment    | checkout (via interface) | ✅ Low    |

### Dependency Graph
catalog ← cart ← checkout → payment
                     ↓
                   orders

### Patterns Detected
✅ Repository pattern for DB access
✅ Service layer separation after refactor
✅ Interface-based payment gateway (swappable)
⚠️ Checkout still has direct dependency on cart internals

### Recommendations
1. Introduce cart interface to decouple checkout → cart
2. Consider event-driven pattern for stock updates
3. Overall: healthy modular monolith — boundaries are clear

### Health Score: 8/10

## Sprint Review Report

### Sprint Goal: "Complete payment flow, security audit, refactoring"
### Sprint Goal Met: ✅ Yes

| Story/Task       | Points | Status      |
|------------------|--------|-------------|
| US-007d Payment  | 5      | ✅ Accepted  |
| Security fixes   | 3      | ✅ Accepted  |
| Code refactoring | 2      | ✅ Accepted  |

### Velocity
- Sprint 1: 10 points
- Sprint 2: 13 points
- Sprint 3: 10 points
- Average velocity: 11 points

/agile-sprint-retro
  What went well: STRIDE caught price tampering before it shipped,
    refactoring improved testability significantly
  What to improve: security audit should happen earlier in the project
  Action: in future projects, run threat model during Sprint 1

/agile-memory-learn
  → Sprint 3 velocity: 10 points
  → Lesson: security audit found 2 critical issues that would
    have shipped without it

## /agile-ship-changelog — v1.0.0

### Added
- Product catalog with CRUD, search, filter, categories (US-001–003)
- Shopping cart: add, remove, update quantities (US-007a)
- Stock validation before checkout (US-007b)
- Checkout with shipping address and tax calculation (US-007c)
- Payment processing with order creation (US-007d)

### Security
- Server-side price calculation (prevents price tampering)
- Parameterized queries (prevents SQL injection)
- STRIDE threat model documented
- OWASP Top 10 audit passed (0 S0/S1 findings)

### Improved
- Checkout module refactored: CartService, CheckoutValidator,
  PaymentGateway extracted (400 → 120 lines)

/agile-ship-release
  🚀 @devops: Release v1.0.0
    Branch: release/v1.0.0 from develop
    CI: ✅ Green (28 tests passing)
    Merged to main ✅
    Tagged: v1.0.0 ✅
    Back-merged to develop ✅

/agile-ship-deploy
  🚀 @devops: Deployed v1.0.0
    Smoke tests: ✅ All endpoints responding
    Security scan: ✅ No vulnerabilities
    Health check: ✅