build(sdk): add exports.bun condition pointing at src for compile

bun build --compile in the cli release workflow couldn't resolve
@claudemesh/sdk because dist/ never gets built (--ignore-scripts).
adding exports.bun -> ./src/index.ts lets bun consume the typescript
sources directly while npm consumers keep using dist/.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/sdk/package.json

@@ -4,6 +4,14 @@
   "description": "SDK for connecting any process to a claudemesh mesh",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "bun": "./src/index.ts",
+      "import": "./dist/index.js",
+      "default": "./dist/index.js"
+    }
+  },
   "scripts": {
     "build": "tsc",
     "clean": "rm -rf dist"