Build Phase

Implement the next incomplete phase of a plan — one phase per invocation.

Context window: recommend /clear before starting to maximize token budget.

Interactive prompts: present options as a numbered list and wait for the user's choice.

Input

The argument (if provided) is: $ARGUMENTS

Use argument as <slug>. If empty, list plans as numbered options and wait for the user's choice.

Accepts slug or @file reference: