fix(db): add extra_large to pet_size_category enum (GRO-1999)

GRO-1999: UAT seed-test-data job (image 2026.05.31-5390131) crashes with
22P02 'invalid input value for enum pet_size_category: "extra_large"'.
seed.ts petSizeCategoryPool and the drizzle schema both use
'extra_large', but migration 0031_buffer_rules.sql created the enum
with 'xlarge' instead — same migration drift pattern that GRO-1971
fixed for coat_type.

Add migration 0037_add_extra_large_to_pet_size_category.sql that
ALTERs the enum to add the missing 'extra_large' value (idempotent,
auto-commit because Postgres forbids ALTER TYPE ADD VALUE inside a
transaction block). Register idx 37 in the drizzle journal.

Mirror the UAT_PLAYBOOK entry from GRO-1971: TC-API-3.28 verifies the
pet_size_category enum has all 4 values used by seed.ts after the seed
job completes, so future enum drift is caught at the UAT gate.

Refs: GRO-1950 (UAT regression that surfaced this), GRO-1971
(pattern this fix mirrors), GRO-1979 (parallel fix landed on a
different branch via PR #124 — this is the GRO-1983 baseline equivalent).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/migrations/0037_add_extra_large_to_pet_size_category.sql

@@ -1,5 +1,5 @@
 -- Migration: 0037_add_extra_large_to_pet_size_category.sql
--- GRO-1979: Adds the 'extra_large' value to the pet_size_category enum.
+-- GRO-1999: Adds the 'extra_large' value to the pet_size_category enum.
 --
 -- 0031_buffer_rules.sql created pet_size_category with values
 -- ('small', 'medium', 'large', 'xlarge'), but seed.ts and the drizzle

packages/db/migrations/0038_register_extra_large_pet_size_category.sql

@@ -1,4 +0,0 @@
--- GRO-1999: 0037 was skipped on existing DBs due to a below-high-water-mark
--- journal timestamp. Re-register extra_large with a monotonic timestamp so
--- the existing UAT/persistent DBs apply it. Idempotent.
-ALTER TYPE "pet_size_category" ADD VALUE IF NOT EXISTS 'extra_large';

packages/db/migrations/meta/_journal.json

@@ -260,13 +260,6 @@
       "when": 1751500000000,
       "tag": "0037_add_extra_large_to_pet_size_category",
       "breakpoints": true
-    },
-    {
-      "idx": 38,
-      "version": "7",
-      "when": 1780000000000,
-      "tag": "0038_register_extra_large_pet_size_category",
-      "breakpoints": true
     }
   ]
-}
+}