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/routes/setup.ts

@@ -1,6 +1,6 @@
 import { randomBytes, randomUUID } from "node:crypto";
 import type { FastifyInstance } from "fastify";
-import { eq, laneDevices, setupState, type Db } from "@parking/db";
+import { eq, devices, setupState, type Db } from "@parking/db";
 import {
   hasPreconditions,
   hasPushConfig,
@@ -10,6 +10,7 @@ import {
   registry,
   setDeviceLogSink,
   type DeviceCategory,
+  type DeviceConfig,
 } from "@parking/devices";
 import { requireRole } from "../auth.js";
 import { backendIpCandidates, backendIpForDevice, backendPort } from "../net.js";
@@ -18,10 +19,12 @@ import { backendIpCandidates, backendIpForDevice, backendPort } from "../net.js"
 // per lane. See wiki/concepts/first-run-setup.md.
 
 interface AssignBody {
-  lane: number;
   category: DeviceCategory;
   driverId: string;
-  config: Record<string, string | number | boolean>;
+  // Driver config (opaque JSON, validated by the driver). Carries the model's
+  // direction/binding: access → config.relays=[{relay,direction,button?}];
+  // reader/camera → config.controllerId + config.relay. See entry-exit-points.md.
+  config: DeviceConfig;
   /** Optional: the backend IP the device should push to (overrides auto-pick;
    *  matters on multi-NIC hosts). */
   backendIp?: string;
@@ -48,13 +51,7 @@ function redactSecrets(config: Record<string, unknown>): Record<string, unknown>
   return out;
 }
 
-export async function setupRoutes(
-  app: FastifyInstance,
-  db: Db,
-  // Called after the set of assignments changes (assign/unassign) so the caller
-  // can refresh anything derived from it — e.g. the device id->lane map.
-  onAssignmentsChanged: () => void = () => {},
-): Promise<void> {
+export async function setupRoutes(app: FastifyInstance, db: Db): Promise<void> {
   registerBuiltinDrivers();
   setDeviceLogSink((line) => app.log.info(line));
 
@@ -110,7 +107,7 @@ export async function setupRoutes(
     { preHandler: adminGuard },
     async () => {
       const state = await db.select().from(setupState).where(eq(setupState.id, 1)).get();
-      const rows = await db.select().from(laneDevices).all();
+      const rows = await db.select().from(devices).all();
       const assignments = rows.map((r) => ({ ...r, config: redactSecrets(r.config) }));
       return { completedAt: state?.completedAt ?? null, assignments };
     },
@@ -154,15 +151,15 @@ export async function setupRoutes(
     },
   );
 
-  // Assign a device to a lane. Validates the chosen driver + config, configures
-  // the device (fix preconditions + set up Digest-authenticated input push — no
-  // manual device-web-UI step by the admin), then persists. Fails the save if
-  // the device can't be configured. See wiki/concepts/device-input-flow.md.
+  // Assign a device. Validates the chosen driver + config, configures the device
+  // (fix preconditions + set up Digest-authenticated input push — no manual device-
+  // web-UI step by the admin), then persists. Fails the save if the device can't be
+  // configured. See wiki/concepts/device-input-flow.md, entry-exit-points.md.
   app.post<{ Body: AssignBody }>(
     "/api/setup/assign",
     { preHandler: adminGuard },
     async (req, reply) => {
-      const { lane, category, driverId, config, backendIp } = req.body;
+      const { category, driverId, config, backendIp } = req.body;
       const driver = registry.get(driverId);
       if (!driver || driver.category !== category) {
         return reply.code(400).send({ error: `invalid driver for ${category}: ${driverId}` });
@@ -252,14 +249,12 @@ export async function setupRoutes(
 
       const row = {
         id,
-        lane,
         category,
         driverId,
         config: fullConfig,
         enabled: true,
       };
-      await db.insert(laneDevices).values(row);
-      onAssignmentsChanged(); // refresh derived state (device->lane map)
+      await db.insert(devices).values(row);
       // Don't echo device secrets back (push Digest password, web-UI login, …).
       return reply.code(201).send({
         ...row,
@@ -285,13 +280,12 @@ export async function setupRoutes(
     async (req, reply) => {
       const existing = await db
         .select()
-        .from(laneDevices)
-        .where(eq(laneDevices.id, req.params.id))
+        .from(devices)
+        .where(eq(devices.id, req.params.id))
         .get();
       if (!existing) return reply.code(404).send({ error: "no such device assignment" });
-      await db.delete(laneDevices).where(eq(laneDevices.id, req.params.id));
-      onAssignmentsChanged(); // refresh derived state (device->lane map)
-      app.log.info(`unassigned device ${req.params.id} (${existing.category}/${existing.driverId}, lane ${existing.lane})`);
+      await db.delete(devices).where(eq(devices.id, req.params.id));
+      app.log.info(`unassigned device ${req.params.id} (${existing.category}/${existing.driverId})`);
       return reply.code(204).send();
     },
   );