Extend the connector's knowledge retrieval (previously local .md/.txt only)
to a DingTalk knowledge base via --knowledge-source wiki:<spaceId> (and
doc:<docId>). On startup the connector pulls the space by reusing the existing
`doc` tools that back `dws doc list` / `dws doc read` (list_nodes +
get_document_content) through the shared executor.Runner -- no new DingTalk API
call is implemented. Pulled documents are dumped as markdown into a local cache
(~/.dws/connect/<clientId>/knowledge/wiki-<spaceId>/) and indexed by the same
chunker/retriever as the local-directory source.
Refresh on startup; on a pull failure (network/permission) fall back to a stale
cache if present, otherwise an empty knowledge base -- the connection is never
blocked. The legacy --knowledge-dir source is untouched and coexists.
Node listing uses a shallow id lookup so a response wrapper object is not
mistaken for a single node (which would drop sibling nodes).
修雨