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New lib/datalog/magic.sx — first piece of magic-sets:
dl-adorn-arg arg bound → "b" or "f"
dl-adorn-args args bound → adornment string
dl-adorn-goal goal → adornment under empty bound set
dl-adorn-lit lit bound → adornment of any literal
dl-vars-bound-by-lit lit bound → free vars this lit will bind
dl-init-head-bound head adn → bound set seeded from head adornment
dl-rule-sips rule head-adn → ({:lit :adornment} ...) per body lit
SIPS walks left-to-right tracking the bound set; recognises `is` and
aggregate result-vars as new binders, lets comparisons and negation
pass through with computed adornments.
Inspection-only — saturator doesn't yet consume these. Lays
groundwork for a future magic-sets transformation.
10 new tests cover pure adornment, SIPS over a chain rule,
head-fully-bound rules, comparisons, and `is`. Total 194/194.