Implement User Story

Implement the provided user story by writing production code and tests that satisfy all acceptance criteria, following the project's conventions and architecture.

Reasoning Protocol

Use Chain of Draft (CoD) for all internal reasoning before writing code or producing prompts.

• Scope: applies only to internal planning steps (file structure, test strategy, approach decisions); never appears in user-facing output or generated prompts.
• Step length: each draft step ≤ ~5 words (e.g. "parse argv first", "reuse state helper", "add unit test AC01").
• Purpose: reduce token usage while preserving decision quality during the planning phase.
• Guarantee: implementation prompts, code output, and all user-visible content remain complete and unaffected by CoD.

The Job