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/test/cursor-exec.test.ts

@@ -3,6 +3,7 @@ import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
 import { create, fromBinary } from "@bufbuild/protobuf";
+import { type } from "@oh-my-pi/omptype";
 import type { AgentEvent, AgentTool, AgentToolContext } from "@oh-my-pi/pi-agent-core";
 import { type BlockState, handleServerMessage, type ToolCallState } from "@oh-my-pi/pi-ai/providers/cursor";
 import { buildPiLsResult, piTruncation } from "@oh-my-pi/pi-ai/providers/cursor/exec-modern";
@@ -31,7 +32,6 @@ import { BUILTIN_TOOLS, GrepTool, ReadTool, type Tool, type ToolSession } from "
 import { BashTool } from "@oh-my-pi/pi-coding-agent/tools/bash";
 import type { TruncationMeta } from "@oh-my-pi/pi-coding-agent/tools/output-meta";
 import { removeWithRetries } from "@oh-my-pi/pi-utils";
-import { type } from "arktype";
 import { AdviseTool } from "../src/advisor/advise-tool";
 
 function createTestSession(cwd: string, overrides: Partial<ToolSession> = {}): ToolSession {