"挂载的本地知识库不生效" was hard to diagnose: a dir of pdf/docx/json indexes
nothing, and a per-message retrieval miss was silent — both look identical to
the operator. Make the knowledge path observable and a bit more forgiving.
- index the .md/.txt FAMILY (.md/.markdown/.mdx/.txt/.text), not just .md/.txt
- loadKnowledgeBase logs how many files indexed vs skipped, and the empty-dir
error now says only text is indexed (pdf/docx/json are not)
- augment logs per message whether it injected N chunks or missed (so a wrong
knowledge dir / non-overlapping question is visible, not silent)
Tests: isKnowledgeTextExt, markdown-family indexing, clear no-text-files error.
修雨
b2fd204e67