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New lib/datalog/api.sx: dl-program-data facts rules takes SX data lists. Rules accept either dict form or list form using <- as the rule arrow (since SX parses :- as a keyword). dl-rule constructor for the dict shape. dl-assert! adds a fact and re-saturates; dl-retract! drops EDB matches, wipes all rule-headed IDB relations, and re-saturates from scratch — simplest correct semantics until provenance tracking arrives. 9 API tests cover ancestor closure via data, dict-rule form, dl-rule constructor, incremental assert/retract, cyclic-graph reach, assert into empty, fact-style rule (no arrow), dict passthrough.