Query predicates aren't validated

[BekaValentine]

In the JS library, we accidentally had predicates #eq and #not-eq, which are incorrect (they should be #eq? and #not-eq?), but which caused no error during execution. They simply failed silently.

This is obviously a problem with tree-sitter, but also it would be good if we had some kind of query validation as well, since we clearly cannot rely on tree-sitter.

[BekaValentine]

cc @hendrikvanantwerpen @robrix

[robrix]

Echoing some of what you've said above, this is probably a good candidate for issues against tree-sitter and/or tree-sitter-graph, if such don't already exist.