PGO adopted at −13.3%

Profile-guided optimization takes the headline from 1.749× to 1.451× Node in one build change; two more waves the same day reach 1.330×.

5cafcb10. Every capture since has been a PGO build with the profile's hash, the recipe, the compiler, the linker and the source snapshot all recorded in the artifact; the working rule is "PGO retrain before any headline capture" and "never promote a dirty, filtered, non-PGO, or incomplete-engine artifact".