feat(booth): disable card tender until a P2PE POS is on-site (cash-only)

No card processor / POS terminal on any site yet. Offering "Card" would let an
operator record a card payment that never cleared a terminal, corrupting the
till reconciliation — a fraud/error surface on an operator-adversary system.

Add apps/web/src/lib/features.ts → CARD_PAYMENTS_ENABLED=false, gating both
tender pickers (BoothPayModal, SubscriptionManager). With card off there's
nothing to choose, so the tender row is suppressed and payment defaults to
cash. UI-only gate: the Tender type, payment events, shift accounting, and
reports still understand `card`, so historical card events and a future
re-enable stay coherent.

Verified via Playwright: an unpaid-ticket modal shows Total + "Pay + open
barrier" with no tender/cash/card row.

Wiki: new concepts/card-payments.md records the current cash-only state, the
PCI-scope-out-of-app constraint, the future-POS device requirements, and the
re-enable path (flip the flag once a bank-certified P2PE terminal is
provisioned). Linked from index, parking-session, open-questions #3.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

wiki/concepts/card-payments.md

@@ -0,0 +1,76 @@
+---
+type: concept
+tags: [parking, payment, pci, p2pe, pos, threat-model]
+sources: [parking-system-architecture]
+updated: 2026-07-01
+status: open
+---
+
+# Card payments (P2PE POS) — disabled until a terminal is on-site
+
+The app **models** a `card` tender end-to-end, but as of **2026-07-01 there is no card processor /
+POS terminal on any site**, so the card option is **disabled in the UI**. This page records why,
+what a future POS needs, and how to re-enable — so the gap isn't rediscovered as "why can't I take a
+card?".
+
+## Current state — CASH ONLY (2026-07-01)
+
+- The booth pay/exit modal and the subscription-sale form show **cash only**. The tender picker is
+  **suppressed entirely** when there's nothing to choose (payment silently defaults to `cash`).
+- Nothing about the data model changed: `Tender = "cash" | "card"` still exists ([[technology-stack|
+  shared]] `packages/shared`), the server/`payment` events, [[shift]] accounting, and
+  [[reporting-analytics|reports]] all still understand `card` — this is **only a UI gate**, so any
+  historical `card` events (or a future re-enable) stay coherent.
+- Flag: **`apps/web/src/lib/features.ts` → `CARD_PAYMENTS_ENABLED = false`**. Both tender pickers
+  (`BoothPayModal.tsx`, `SubscriptionManager.tsx`) render card only when it is `true`.
+
+**Why disable rather than leave it?** Offering "Card" with no terminal lets an operator record a card
+payment that **never actually cleared** — money that isn't in the drawer and didn't hit the bank —
+which silently corrupts the [[shift|till reconciliation]] and the [[reconciliation|financial audit]].
+On a system whose adversary is the [[threat-model|booth operator]], a tender the site can't fulfil is
+a fraud/error surface, not a convenience. Cash-only is the honest state until hardware exists.
+
+## The constraint a POS must satisfy — PCI scope stays OUT of the app
+
+This is a **standing architectural rule** ([[bom]], [[open-questions]] #3, [[parking-session]]):
+card capture goes through a **standalone, bank-certified P2PE (point-to-point encryption) terminal** —
+the application **must never see card data (PAN, track, CVV)**. The app only records that a payment's
+`tender` was `card`; the terminal does the capture, encryption, and settlement against the acquiring
+bank. This keeps the whole appliance **out of PCI-DSS scope**, which is a hard requirement (a booth PC
+in PCI scope is a non-starter).
+
+The terminal model is **dictated by the acquiring bank** (not our choice) — verify local
+availability (Albania/EU) when the bank is chosen. See [[bom]] "Payment".
+
+## Future POS device — what has to be configured (open)
+
+When a terminal is procured, this is the outline (details TBD — flag on [[open-questions]] #3):
+
+1. **Hardware**: a bank-certified standalone P2PE terminal beside the booth PC + the cash drawer.
+2. **Integration boundary**: decide how the app learns a card sale succeeded WITHOUT touching card
+   data — options range from *manual* (operator runs the card on the terminal, then confirms in the
+   app → a `card` `payment` event) to a *terminal-integration* (the app requests an amount, the
+   terminal returns an approved/declined result over a local link). The manual path keeps PCI scope
+   trivially out; an integration must preserve the same boundary (no PAN ever reaches the app).
+3. **Device model**: if integrated, the terminal becomes a [[device-registry|device adapter]] behind
+   an interface (like reader/printer/relay) — a `payment-terminal` capability — so a hardware swap is
+   a new adapter, nothing else. A *manual* terminal needs no adapter (it's off-system; the app just
+   records the tender).
+4. **Reconciliation**: card takings must reconcile against the **terminal's/bank's** settlement
+   report, separately from the cash drawer (card money never enters the drawer). [[shift]] Z-reports
+   already split cash vs card totals — wire the card side to the terminal batch.
+
+## Re-enabling
+
+1. Provision + configure the terminal (per above).
+2. Flip `CARD_PAYMENTS_ENABLED = true` in `apps/web/src/lib/features.ts`. The tender pickers reappear.
+3. If integrated, add the `payment-terminal` adapter + wire the approved-result → `card` `payment`
+   event. If manual, no code beyond the flag.
+4. Update this page (→ `status: settled`) and [[open-questions]] #3.
+
+## Relates
+
+- [[bom]] — the payment subsystem line (certified P2PE terminal + cash drawer, PCI-out-of-scope).
+- [[open-questions]] #3 — payment subsystem (manned booth P2PE vs unmanned pay station).
+- [[parking-session]] / [[shift]] — where `tender` is recorded and reconciled.
+- [[threat-model]] — why a tender the site can't fulfil is a fraud surface.

wiki/concepts/parking-session.md

@@ -148,6 +148,7 @@ follow this page and [[tariff]]; the decision is recorded in [[session-model]].
   `graceExitMin`). An operator `overrideMinor` covers lost-ticket/dispute (recorded as the charged
   amount + the quoted amount). Pay-on-foot: payment is decoupled from the exit lane. PCI scope stays
   out of the app — `tender` only records cash/card; card capture is the standalone P2PE terminal.
+  (Card is currently **disabled in the UI** — no POS on-site yet; cash-only. See [[card-payments]].)
   - **The full transient loop now passes end to end** (verified): entry → quote → pay → exit opens,
     session closed, `verifyChain` ok.