a8bc2b36

Created Started Finished

By: syd <syd@kronor.io>

Collect the measurement lessons, and drop the orphaned guard script

The corrections this document accumulated are the most transferable content in
it: anyone measuring a Nix build on a real machine will hit at least one of a
per-derivation upload hook, keep-outputs making deletion a no-op, a repeated
identical mutation measuring the cache, or a divided total inheriting every
contaminant in it. Collected as rules, separated from this repository
specifics, with the cost tables left clean.

scripts/check-graph-agreement.mjs went unreferenced when the guard was rewritten
to ask pnpm instead of comparing a generated table against the manifests it was
generated from.