fix: add test/tsconfig.json so IDE resolves path aliases in test files

Keep src/ isolated in the root tsconfig to prevent accidental imports
of test-only exports into source code. The test tsconfig extends root
and covers both src/ and test/ — VS Code/Zed pick it up automatically
for any file under test/.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: priosshrsth

test/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "extends": "../tsconfig.json",
+  "include": ["../src/**/*", "./**/*"]
+}

tsconfig.json

@@ -26,6 +26,6 @@
     "noPropertyAccessFromIndexSignature": false
   },
 
-  "include": ["src/**/*", "test/**/*"],
+  "include": ["src/**/*"],
   "exclude": ["node_modules", "dist", "bunup.config.ts"]
 }