fitInspectionPayload counted the UTF-8 size of an 8-12 MB wire with a per-character loop and ran every omission step on the main thread in one turn (PR #277 final review M7). The size is now counted by TextEncoder encodeInto through one bounded scratch buffer, and each re-measure follows a yieldControl turn, with an abort signal checked between steps. The fit is async; the fitted payload is the same as before.