CONTACTUS, from the forged blade to its minimal executable inscription

CONTACTUS does not begin by postulating an operator. Its source is IGNITIO DIFFERENS, where the blade is constituted starting only from Difference. CONTACTUS asks a different question: what is the poorest inscription capable of carrying that forge without adding anything to it? Replaying the forge under this constraint, RUN01–03 constitute the candidate grammatical debt and yield a single surviving core, D plus nestable division, in which a division must be inscribable without being reduced to the inscriptions it keeps discriminated, and material that remains Difference can be admitted again without changing grammatical species. RUN04–10 are then used only as a falsification wall: each is tested for whether it forces the grammar to grow. A new terminal (Border), a new operation (reassimilation, failure types), referential structure (reference, identity, alias, copy, pair, pointer), state or parameter, branching and arity (branch, children, left, right, field, axis, dimension, slot, coordinate), an observer or meta-level (recognize, match, validate, schema), and relation or adjacency (edge, link, between, adjacent) all fail the Reverse test: deleting them removes no certified operational capacity. The grammar therefore does not grow. Terminal registrations, NOVELTY, COMBINATION, RECURSION, are not primitives, and a declared recursion construct is forbidden as constitutive: the property must appear rather than be encoded in advance. The grammatical debt and the notation-class debt are closed, the surviving notation class being a division mark that syntactically determines its own scope. The concrete-glyph debt remains open, under a ten-point audit forbidding hidden function, order, branching, identity, state, recursion primitive, observer, relation, or numerical depth counter. Machine-readable serialization is forbidden until the notation is frozen, and external applications are forbidden as constitutive material.