chore: add TypeScript build cache to gitignore

- Add *.tsbuildinfo to .gitignore to exclude TypeScript build cache
- Remove tsconfig.tsbuildinfo from git tracking
- This prevents auto-generated build files from being committed

Author: claude

.gitignore

@@ -27,6 +27,11 @@ out/
 build
 dist
 
+# ===================================
+# TypeScript
+# ===================================
+*.tsbuildinfo
+
 # ===================================
 # Runtime & Logs
 # ===================================