The tool runner now takes a call's caller from the subject it arrived on and
hands it to the module through the SDK (stdio.CallerOf); the tracker records
that bus user on what each verb writes instead of unproven. Never from the
arguments, which still refuse any caller, and unproven where the runtime proves
none. Needs mesh-sdk's go/caller.go (pinned at its branch head until merged).
mesh/merge-gate pass: builds new: modules/mesh-issues, sent nowhere; no bus step; every machine composes with the change as it did without (4 of 4 compose)
The seat issue-tracker, held once for the mesh: open, get, list, move, note
and link. The counter is advanced by the SDK's compare-and-set Increment
(go/v0.1.12) and started once at the setting first-number (365, after hq's
highest), never below an issue kept. The cycle's issue rules are refused at
the write; every change is an event. The runtime does not yet say who called,
so every change is recorded as by "unproven" and no argument can name a caller.