Agent A: price orders in an explicit currency

[RollNuts]

Adds a required currency parameter to calculate_total and updates every existing caller and test in this PR. Green on its own.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.
To continue using code reviews, add credits to your account and enable them for code reviews in your settings.

[veripsa-core]

Veripsa — heading to main

✓ You acknowledged this coupling snapshot — branch protection still decides what merges

This PR reserves: orders/pricing.py, tests/test_pricing.py

Land in order. You collide at lines 11–18 of orders/pricing.py — that's the same code, not just the same file. You are queued behind GH-RollNuts. Landing in this order means you rebase onto their change once — not redo work after both land out of order. When the change ahead lands or withdraws, your reservation advances; if it withdraws, this clears.

Overlapping PRs — 2 open PRs touch this same area. Suggested order to land them (most foundational first, so the others only revise once):

1. GH-RollNuts BR-collide-a
2. GH-RollNuts PR-7 ← this PR

_{Veripsa records what is heading to main and who reserved what — it does not assert correctness. Advisory by default; your branch-protection policy decides what blocks.}

✓ Acknowledged — you recorded that you saw this coupling snapshot. Someone added the veripsa-ack label, so Veripsa recorded that you saw this specific coupling and chose to proceed deliberately. This is NOT an approval, a pardon, or a sign-off — Veripsa does not assert the change is correct, and adding the label only records your acknowledgement; whether the PR can merge is decided by your branch-protection policy and reviewers, not by Veripsa. If the coupling changes (a different overlapping PR or files), Veripsa will pause again until you re-acknowledge the new snapshot. (Records-not-correctness — Veripsa records the acknowledgement; it never blocks by itself and it never approves by itself.)

[RollNuts]

Closing — superseded by the fresh canonical collision pair #13 / #14 (2026-07-20)

This PR touches orders/pricing.py, the same file the fresh canonical demo pair (#13 Agent A / #14 Agent B) collides on. Left open, its active same-path reservation would mix into the fresh pair's landing-order evaluation, muddying a clean two-PR demo. Closing to remove it from active demo traffic.

Historical evidence preserved (not deleted): this PR, its files (orders/pricing.py, tests/test_pricing.py), and its Veripsa output — Veripsa — Acknowledged (neutral) — remain in-thread: #7 (comment)

The canonical current demo is the two-PR pair #13 → #14 only.