Builds a structured cost-model architecture for an AI-assisted project — a fixed taxonomy of cost categories, each expressed as a named-parameter formula (never a guessed number), applied consistently across low/base/high scenarios and cross-referenced against project scope tiers. Invoke when a project needs a budget architecture, a grant/funder cost-justification section, an LLM/API cost estimate, or a low/base/high cost scenario, and no real rates or totals should be invented at planning time.
