feat(carwash): advisory vehicle category from the entry camera — mapping, pre-select, downgrade flag

The app plumbing for venue-modules.md §"Vehicle category from vision"; the model is the
open half (no bundled recognizer emits body_type yet, so the desk shows nothing until
phase A lands in the vision service).

- Shared: VEHICLE_CLASSES vocabulary, VehicleRead, CARWASH_VISION_THRESHOLD_DEFAULT,
  reason code carwash.categoryDowngrade; settings/order/lookup views carry the read.
- Vision contract: /analyze vehicle.body_type + confidence (service schema); the Node
  client normalises to the vocabulary and drops the rest.
- Record: snapshot.ts stores the read in the plate's device_events row (or its own when
  the plate was unreadable); vehicleForIdentity() resolves it like the plate.
- Car wash: carwash_categories.vision_classes (site mapping "car, sedan → Vetura"),
  carwash_config.vision_threshold (signed config_change when it moves), four vision
  columns on orders — migration 0030. Lookup returns vision + suggestedCategoryId.
- Desk pre-selects the mapped category and shows the read + snapshot thumbnail; Setup
  offers class chips per category and the threshold. Operator decides.
- Flag: a read at/above the threshold whose mapped category prices HIGHER than the chosen
  one signs one `anomaly` (both categories/prices, operator, snapshot) and stores its id on
  the order. Equal/upgrade/unsure/unmapped → nothing. Recorded only, never blocks, no
  reason prompt (user, 2026-09-06).

Tests in carwash.test.ts; wiki venue-modules (As built), opencv-anpr-service, log.

Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU

packages/db/drizzle/0030_carwash_vision.sql

@@ -0,0 +1,15 @@
+-- Car Wash: advisory vehicle category from vision (venue-modules.md §Vehicle category from
+-- vision). Categories map the vision vocabulary onto the site's own price categories; an
+-- order records what the camera saw, the category it suggested and the anomaly signed on a
+-- downgrade; the config carries the confidence floor. Recorded only — never blocks.
+ALTER TABLE `carwash_categories` ADD `vision_classes` text DEFAULT '[]' NOT NULL;
+--> statement-breakpoint
+ALTER TABLE `carwash_orders` ADD `vision_class` text;
+--> statement-breakpoint
+ALTER TABLE `carwash_orders` ADD `vision_confidence` real;
+--> statement-breakpoint
+ALTER TABLE `carwash_orders` ADD `vision_category_id` text;
+--> statement-breakpoint
+ALTER TABLE `carwash_orders` ADD `downgrade_event_id` text;
+--> statement-breakpoint
+ALTER TABLE `carwash_config` ADD `vision_threshold` real DEFAULT 0.8 NOT NULL;

packages/db/drizzle/meta/_journal.json

@@ -211,6 +211,13 @@
       "when": 1788690000000,
       "tag": "0029_role_jobs",
       "breakpoints": true
+    },
+    {
+      "idx": 30,
+      "version": "6",
+      "when": 1788700000000,
+      "tag": "0030_carwash_vision",
+      "breakpoints": true
     }
   ]
 }