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/coding-agent/src/tools/learn.ts

@@ -1,5 +1,5 @@
+import { type } from "@oh-my-pi/omptype";
 import type { AgentTool, AgentToolResult } from "@oh-my-pi/pi-agent-core";
-import { type } from "arktype";
 import { sanitizeSkillName, writeManagedSkill } from "../autolearn/managed-skills";
 import { isNameClaimedByAuthoredSkill } from "../extensibility/skills";
 import { localBackend } from "../memory-backend/local-backend";