fix(sdk): replace @loop-engine/dsl with @loop-engine/loop-definition

- Move DSL implementation into @loop-engine/loop-definition (shared with registry-client)
- SDK re-exports LoopBuilder, YAML helpers, validateLoopDefinition; add sdk/dsl subpath
- Remove @loop-engine/dsl workspace package; registry-client imports loop-definition
- Update check-boundary, schema note, and tsconfig examples paths
- Honors deprecation: consumers use @loop-engine/sdk (and sdk/dsl) as the published surface

Author: betterdataco

apps/playground/package.json

@@ -9,7 +9,6 @@
     "test": "vitest run --passWithNoTests"
   },
   "dependencies": {
-    "@loop-engine/dsl": "workspace:*",
     "@loop-engine/events": "workspace:*",
     "@loop-engine/guards": "workspace:*",
     "@loop-engine/runtime": "workspace:*",

apps/playground/src/app/page.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useMemo, useState } from "react";
-import { parseLoopYaml } from "@loop-engine/dsl";
+import { parseLoopYaml } from "@loop-engine/sdk/dsl";
 import { InMemoryEventBus } from "@loop-engine/events";
 import { GuardRegistry } from "@loop-engine/guards";
 import { createLoopSystem } from "@loop-engine/runtime";

packages/dsl/.gitkeep

@@ -1,14 +1,13 @@
 {
-  "name": "@loop-engine/dsl",
-  "version": "0.2.0",
+  "name": "@loop-engine/loop-definition",
+  "version": "0.1.0",
+  "description": "YAML parse/serialize, validation, and LoopBuilder for loop definitions (shared by @loop-engine/sdk and @loop-engine/registry-client).",
   "license": "Apache-2.0",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/loopengine/loop-engine.git",
-    "directory": "packages/dsl"
+    "directory": "packages/loop-definition"
   },
-  "description": "Internal: YAML/builder/validator for the monorepo. Published API: @loop-engine/sdk.",
-  "private": true,
   "type": "module",
   "main": "./dist/index.cjs",
   "module": "./dist/index.js",
@@ -32,7 +31,6 @@
   },
   "files": [
     "dist/",
-    "README.md",
     "LICENSE"
   ],
   "engines": {
@@ -42,12 +40,11 @@
   "sideEffects": false,
   "keywords": [
     "loop-engine",
-    "core",
-    "state-machine",
-    "ai-governance",
-    "human-in-the-loop",
     "yaml",
-    "builder",
-    "definition"
-  ]
+    "state-machine",
+    "loop-definition"
+  ],
+  "publishConfig": {
+    "access": "public"
+  }
 }