/implement

After /rpi/plan - execute with parallel agents

# Implement Plan

**Input:** $ARGUMENTS

Parse the input above. It may be:
- A direct path to a plan file
- A topic name (look in `.claude/plans/{topic}.plan.md`)
- A description with guidance on what to prioritize, skip, or handle differently

Extract the plan reference and any implementation guidance.

## Objective

Execute the implementation plan by delegating work to agents. Maximize parallelism while respecting dependencies.

## Process

### 1. Read the Plan

- Load the plan document provided as input
- If the plan references sub-plans (large multi-phase plans), **implement only the cu...