5d-spec

# SPEC Phase

Formalize the plan into technical specification.

## Spec Structure

### 1. Overview

One paragraph linking back to the plan. What is being built and why (from PLAN.md).

### 2. Architecture

Describe the technical approach:
- Components and their responsibilities
- Data flow between components
- External integrations
- Key technical decisions with rationale

Use diagrams where helpful (mermaid, ASCII, or description).

### 3. Data Model

Define data structures:
- Entities and relationships
- Key fields and types
- Validation rules
- Storage approach

### 4. Interface Contracts

For each boundary (API, UI, integration):
- Inputs (with types and constraints)
- Outputs (with types and error cases)
- Behavior specification

### 5. Domain Bridge (Width)

Explicitly connect technical decisions to business/user intent:

| Business Need | Technical Implementation |
|---------------|-------------------------|
| [need from plan] | [how spec addresses it] |

This prevents spec drift from plan intent.

### 6. Quadrant Coverage

Ensure spec addresses all perspectives:

| Quadrant | Spec Element |
|----------|--------------|
| Individual Outer | Components, interfaces, data structures |
| Individual Inner | Skills/knowledge required to implement |
| Collective Outer | System integrations, infrastructure |
| Collective Inner | Team alignment, review needs |

### 7. Skill Dependencies (Height)

Document implementation prerequisites:
- What capabilities must the team have?
- What domain expertise is required?
- What learning must happen before or during implementation?

### 8. Identity Trap Check

Flag where spec might be protecting assumptions rather than solving problems:
- Are any technical decisions "because we always do it this way"?
- What alternatives were dismissed too quickly?

### 9. Testability Criteria

For each spec item, define how correctness is verified:

| Spec Item | Verification Method |
|-----------|-------------------|
| [item] | [how we know it's