devices: pool-of-spaces model — drop lane, per-relay direction

A parking lot is one pool of spaces with a flexible set of entry/exit
points — no "lane". Direction is a property of each RELAY inside an access
controller; readers/cameras bind to a controller relay and inherit it.

Schema:
- drop `lane` from ledger_events, device_events, sessions
- rename lane_devices -> devices (no lane/direction columns)
- access config.relays=[{relay,direction,button?}]; reader/camera
  config.controllerId+relay binding
- fresh 0000_baseline migration (history reset; dev data was throwaway)

Signed ledger:
- remove `lane` from canonicalize(); bump signer keyId sw-hmac-v1 -> v2
  (v1 events won't verify under v2 — intentional, gated per-event by keyId)

Server:
- new device-resolve.ts (replaces lane-map.ts): relayForButton,
  relayForDevice, firstRelayByDirection, devicesByDirection
- entry-flow: button terminal -> its relay; exit/permit: reader's bound
  relay; dispatcher resolves the bound relay + inherited direction
- camera snapshots fire by direction site-wide, async, never block open
- DeviceConfig widened to nested JSON for relays[]

Web:
- wizard: no lane selector; add controllers (relay map + entry-button
  terminal) first, then bind readers/cameras/printers to a controller relay

Wiki: new entry-exit-points.md (replaces lane-direction); reworked
entry-exit-readers, parking-session, first-run-setup, device-registry,
append-only-event-chain, device-events; removed stale lane/LaneMap mentions.

apps/server/src/device-events.ts

@@ -8,19 +8,19 @@ import type { PrinterStatus } from "@parking/devices";
 
 export interface DeviceInputEvent {
   readonly driverId: string; // e.g. "dingtian"
-  readonly deviceId: string; // which configured device (lane_devices id)
+  readonly deviceId: string; // which configured device (devices id)
   readonly input: number; // 1-based input/channel
   readonly edge: "on" | "off"; // active / inactive
   readonly at: string; // ISO-8601 (server receive time)
   readonly source: "push" | "poll";
 }
 
-// A credential read at a lane: a ticket scanned at exit, a plate from LPR, a card
-// at a reader. Drives identity-based flows (exit validation, and later permits /
-// pay-station lookup). `kind` mirrors IdentitySource. See parking-session.md.
+// A credential read: a ticket scanned at exit, a plate from LPR, a card at a reader.
+// Drives identity-based flows (exit validation, permits, pay-station lookup). `kind`
+// mirrors IdentitySource. See parking-session.md.
 export interface DeviceReadEvent {
   readonly driverId: string;
-  readonly deviceId: string; // lane_devices id of the reader/scanner/camera
+  readonly deviceId: string; // devices id of the reader/scanner/camera
   readonly value: string; // the ticket id / plate / card number
   readonly kind: "ticket" | "plate" | "qr" | "card";
   readonly at: string; // ISO-8601
@@ -42,8 +42,7 @@ export interface ReadOutcome {
 
 /** A printer's status as tracked by the live monitor (status + identity). */
 export interface PrinterStatusEvent {
-  readonly deviceId: string; // lane_devices id
-  readonly lane: number;
+  readonly deviceId: string; // devices id
   readonly driverId: string;
   readonly role?: string; // entry-dispenser | booth-receipt
   readonly status: PrinterStatus;
@@ -58,7 +57,7 @@ class DeviceEventBus extends EventEmitter {
     return () => this.off("input", cb);
   }
 
-  /** A credential read (ticket scan, plate, card) at a lane. */
+  /** A credential read (ticket scan, plate, card). */
   emitRead(event: DeviceReadEvent): void {
     this.emit("read", event);
   }