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A dict in a rule body that isn't `{:neg <positive-lit>}` (the only
recognised dict shape) used to silently fall through every dispatch
clause in dl-rule-check-safety, contributing zero bound variables.
The user would then see a confusing "head variable(s) X do not
appear in any positive body literal" pointing at the head — not at
the actual bug in the body. Typos like `{:negs ...}` are the typical
trigger.
dl-process-lit! now flags both:
- a dict that lacks :neg
- a bare number / string / symbol used as a body lit
with a clear error naming the offending literal.
1 new regression test; conformance 265/265.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>