wangdl 86054edd5f test: add resolveKnowledgeSource + full type inference tests
- Add resolveKnowledgeSource path test (knowledge_sources/<id>/)
- Add empty knowledge_sources directory test
- Add .txt→text and .epub→epub type inference
- Add .png/.jpg/.jpeg/.webp→image inference
- Remove misleading test that only asserted nil

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-18 13:07:30 +08:00
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