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.

README.md

@@ -606,6 +606,7 @@ For architecture and contribution guidelines, see [packages/coding-agent/DEVELOP
 | **[@oh-my-pi/pi-tui](packages/tui)**                                          | Terminal UI library with differential rendering                             |
 | **[@oh-my-pi/pi-natives](packages/natives)**                                  | N-API bindings for grep, shell, image, text, syntax highlighting, and more  |
 | **[@oh-my-pi/omp-stats](packages/stats)**                                     | Local observability dashboard for AI usage statistics                       |
+| **[@oh-my-pi/omptype](packages/omptype)**                                     | ArkType-compatible schema validation with lazy JIT compilation              |
 | **[@oh-my-pi/pi-utils](packages/utils)**                                      | Shared utilities (logging, streams, dirs/env/process helpers)               |
 | **[@oh-my-pi/pi-wire](packages/wire)**                                        | Shared collab live-session protocol types and relay constants               |
 | **[@oh-my-pi/hashline](packages/hashline)**                                   | Line-anchored patch language and applier behind the `edit` tool             |