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…rphaned clusters
### Summary
**Problem**
When deleting a document from the knowledge base, the parent cluster
could never be located and was therefore never cleaned up, leaving
orphaned clusters in Infinity indefinitely.
**Root Cause**
InfinityConnection.field_keyword() treats all _kwd-suffixed columns as
keyword lists and applies .split("###") to them in get_fields().
parent_kwd was missing from the exclusion list. This caused a parent
cluster name like "Toronto Transit & Authority Control 5e8d5eb6" to
become ['Toronto Transit & Authority Control 5e8d5eb6'] (a
single-element list). When that list was fed into _nav_cluster_id(), it
produced a different hash than the actual cluster's hash (computed from
the plain string), so every deletion-time cluster lookup silently
failed.
**Fix**
Added "parent_kwd" to the exclusion list in field_keyword(), alongside
docnm_kwd, important_kwd, question_kwd, etc.