A slice that never happened still rendered as a row — "0.0%" plus a count
borrowed from elsewhere on the card — which reads as "this ran 323 times in
no time". The ring has always skipped zero arcs; now the legend matches it,
so the card shrinks to the slices that actually carry time.
Zero slices are common: across 307 local sessions, reasoning is zero in
23.5%, answer text in 14.3%, tool args in 13.7%, and tools in 14.3% (a
one-turn "hi" session collapses from six rows to two). Overhead is the
residual and effectively never zero, so the change bites the decode and
tool rows. Every slice is a share of the wall total, so dropping rows never
distorts the remaining percentages.
Bowen Liang
b857d56db3