feat: introduced omptype validation package and migrated workspace dependencies

- Introduce `@oh-my-pi/omptype` as a new ArkType-compatible schema validation package featuring a lazy JIT runtime, JSON Schema emission, and compatibility adapters.
- Replace `arktype` across workspace packages and test utilities with `@oh-my-pi/omptype`.
- Add benchmark suites, tests, and documentation for the new validation engine and adapters.
- Update workspace build, test runner, and release configurations to include the new package.

packages/catalog/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+- Replaced arktype with `@oh-my-pi/omptype` for discovery payload schemas (same definition DSL, lazy JIT validation).
+
 ## [17.2.6] - 2026-08-03
 
 ### Added

packages/catalog/package.json

@@ -35,8 +35,8 @@
   },
   "dependencies": {
     "@bufbuild/protobuf": "catalog:",
+    "@oh-my-pi/omptype": "catalog:",
     "@oh-my-pi/pi-utils": "catalog:",
-    "arktype": "catalog:",
     "zod": "catalog:"
   },
   "devDependencies": {

packages/catalog/src/discovery/antigravity.ts

@@ -1,4 +1,4 @@
-import { type } from "arktype";
+import { type } from "@oh-my-pi/omptype";
 import type { ModelSpec } from "../types";
 import { discoveryFetch, toPositiveNumber } from "../utils";
 import {

packages/catalog/src/discovery/codex.ts

@@ -1,4 +1,4 @@
-import { type } from "arktype";
+import { type } from "@oh-my-pi/omptype";
 import { parseKnownModel, semverEqual } from "../identity/classify";
 import type { FetchImpl, ModelSpec } from "../types";
 import { discoveryFetch } from "../utils";

packages/catalog/src/discovery/cursor.ts

@@ -1,6 +1,6 @@
 import * as http2 from "node:http2";
 import { create, fromBinary, toBinary } from "@bufbuild/protobuf";
-import { type } from "arktype";
+import { type } from "@oh-my-pi/omptype";
 import { isKimiK3ModelId } from "../identity";
 import { bareModelId, parseGlmModel, semverGte } from "../identity/classify";
 import { getBundledModels } from "../models";

packages/catalog/src/discovery/gemini.ts

@@ -1,4 +1,4 @@
-import { type } from "arktype";
+import { type } from "@oh-my-pi/omptype";
 import { getBundledModels } from "../models";
 import { toModelSpec } from "../provider-models/bundled-references";
 import type { FetchImpl, Model, ModelSpec } from "../types";

packages/catalog/src/discovery/openai-compatible.ts

@@ -1,4 +1,4 @@
-import { type } from "arktype";
+import { type } from "@oh-my-pi/omptype";
 import type { Api, FetchImpl, ModelSpec, Provider } from "../types";
 import { discoveryFetch } from "../utils";