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.

packages/db/drizzle/0000_baseline.sql

@@ -11,16 +11,14 @@ CREATE TABLE `blocklist` (
 CREATE TABLE `device_events` (
 	`id` text PRIMARY KEY NOT NULL,
 	`device_id` text,
-	`lane` integer,
 	`category` text,
 	`kind` text NOT NULL,
 	`detail` text,
 	`occurred_at` text DEFAULT (current_timestamp) NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `lane_devices` (
+CREATE TABLE `devices` (
 	`id` text PRIMARY KEY NOT NULL,
-	`lane` integer NOT NULL,
 	`category` text NOT NULL,
 	`driver_id` text NOT NULL,
 	`config` text NOT NULL,
@@ -33,7 +31,6 @@ CREATE TABLE `ledger_events` (
 	`index` integer NOT NULL,
 	`type` text NOT NULL,
 	`direction` text,
-	`lane` integer NOT NULL,
 	`source` text,
 	`identity` text,
 	`payload` text,
@@ -70,7 +67,6 @@ CREATE TABLE `permits` (
 --> statement-breakpoint
 CREATE TABLE `sessions` (
 	`id` text PRIMARY KEY NOT NULL,
-	`lane` integer,
 	`identity` text,
 	`source` text,
 	`permit_id` text,
@@ -85,6 +81,22 @@ CREATE TABLE `setup_state` (
 	`completed_at` text
 );
 --> statement-breakpoint
+CREATE TABLE `site_config` (
+	`id` integer PRIMARY KEY NOT NULL,
+	`capacity` integer,
+	`updated_at` text DEFAULT (current_timestamp) NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `snapshots` (
+	`id` text PRIMARY KEY NOT NULL,
+	`direction` text NOT NULL,
+	`device_id` text,
+	`identity` text,
+	`content_type` text NOT NULL,
+	`bytes` blob NOT NULL,
+	`captured_at` text NOT NULL
+);
+--> statement-breakpoint
 CREATE TABLE `tariff_versions` (
 	`id` text PRIMARY KEY NOT NULL,
 	`tariff_id` text NOT NULL,