Implement Plan

Implement the requirements in $ARGUMENTS.

If no argument provided, search for plan files in the plans/ directory and present them to the user for selection.

Critical: you must create an agent team to implement the plan. Do not try to skip this!

Step 1: Parse Plan

1. Read the plan file specified in $ARGUMENTS
2. Extract all tasks with their dependencies, descriptions, verification requirements, and metadata
3. Parse task metadata -- extract the JSON metadata code fence from each task (see @.claude/rules/plan.md Metadata section for the required schema)
4. Build a dependency graph to determine which tasks can run in parallel

Task Metadata Rules

Each task in the plan file contains a JSON metadata code fence (schema defined in @.claude/rules/plan.md Metadata section).