Nine new modules from four over-cap test files. Every kcd2 test file is
now under 250 lines; only four source files remain.
App.test.tsx ended up with no describe blocks and vitest failed with
"No test suite found" - a split that empties a file has to delete it.
The shared `response`/`ordinary` fixtures went to src/test/fixtures.ts,
which vite.config.ts excludes from coverage; beside the source they
would have counted as production code and broken the 100% gate.
288 tests passing before and after, now across 24 files instead of 15,
coverage still 100% on all four metrics.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY
