The KnowledgeFS retrieval node treated the query text as mandatory even though
a query image is a complete input on its own. Text and image are now
alternatives: the node needs at least one of them, never both.
- web: drop the required mark from the query text field; the checklist fails
only when neither variable is bound (new i18n message in every locale).
- api: make `query_variable_selector` optional with a model-level rule that
one of the two selectors must be set, and only map the query variable when
it is bound. At runtime an empty text without images is a configuration
error; an image-only query retrieves with an empty text, merges spaces on
their own scores instead of a text reranker, skips automatic metadata
extraction, and skips the text-based failed-query capture.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015zw5G5SX3HmVfnZof6YWAc
57d03faa98