chore: exclude snapshot files from TypeScript type checking

Generated snapshot files in __snapshots__ directories contain TypeScript
output from the code generator that is not expected to be type-safe.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Himenon

tsconfig.json

@@ -20,5 +20,5 @@
     "esm": true,
     "swc": true
   },
-  "exclude": ["test/code", "examples/"]
+  "exclude": ["test/code", "examples/", "test/__tests__/**/__snapshots__/**"]
 }