Configure knip to ignore undici-types dependency

undici-types is a type-only dependency required by bun-types for proper
TypeScript type resolution when DOM types are not loaded. It's not directly
imported in our code but is needed for the Response type fallback.

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

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

Author: ndbroadbent

knip.json

@@ -14,5 +14,6 @@
     "src/cli/e2e/vitest.config.ts",
     "src/cli/e2e/helpers.ts"
   ],
+  "ignoreDependencies": ["undici-types"],
   "exclude": ["unresolved"]
 }