Repair is not a sentiment — it's a procedure with two premises and four ways out. Run a broken thing through it and see which way it falls.
Asserts a before — a prior intact state, a break that's real, broken as a from-which not an end. Excludes the unfinished (build it) and the break-denied (the cosmetic mend that acts as if nothing happened).
Asserts a valuer and a comparison already made — repair chosen over replacement and over discard. You don't repair the fungible; you replace it. Repair is reserved for the non-substitutable.
The mend is time-stamped history, not erasure. A fault occurred here, at this place, and was bound — visible repair is honest logging.
Sameness persists through the break, carried by the care and the trace — not by the material staying whole. Continuity that bore a cost.
The mender is a second author; the foreign shard a third. No hand erases the prior ones. Repair is a mesh, never solo.
Boro proves it — mends on mends across generations. The keep opens a maintenance relationship, never a one-shot fix.
The event is B — the judgment that the fracture was worth carrying forward. Everything in the lineage descends from that one decision. And it lands exactly on the folio's law: repair is the delta that scales — the seam carries information, and that carried difference is the identity a replacement can't have. The pristine replacement is the uniform mirror: interchangeable, no history, it holds but says nothing. Mourn is the wholeness-bound value that breaking zeroes — the thing whose worth was in being whole.
The honest limit: because B can say no, the seam-as-beauty becomes a lie the moment it's applied to what should be let go, or to a break that was constitutive. There, repair can build a successor but cannot restore the same thing — and calling it the original is A suppressed, one layer up. A clean lineage keeps its mourn branch intact, and does not repair everything just because it can.