Add explicit type configuration for consistent type resolution

Configure TypeScript to explicitly resolve Node and Bun type definitions,
ensuring bun run lint works consistently across all environments (local,
CI, codex environment, etc.).

Changes:
- Add "types" array to explicitly include node and bun types
- Add "typeRoots" to ensure node_modules/@types is checked
- Add "lib" array for ES2020 standard library types

This addresses the ambient type definition issue identified by @codex
where type resolution could fail in environments without implicit type discovery.

Generated with Claude Code (https://claude.com/claude-code)

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

Author: bwl

tsconfig.json

@@ -9,7 +9,10 @@
     "skipLibCheck": true,
     "resolveJsonModule": true,
     "outDir": "dist",
-    "rootDir": "src"
+    "rootDir": "src",
+    "lib": ["ES2020"],
+    "types": ["node", "bun"],
+    "typeRoots": ["./node_modules/@types"]
   },
   "include": ["src/**/*"],
   "exclude": ["node_modules", "dist"]