quote.sx — cart-quote composes the pipeline into a deterministic
{:subtotal :discount :tax :total :codes} with total = subtotal - discount +
tax. Explicit tax policy: tax on gross per-line amounts (discount reduces
payable, not the tax base). This quote is the value the Phase-3 order flow
carries. Total 112/112 across 7 suites.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
