Two rules for section 13's errands, both from row 54's `GO HEAL`: 204 starts at a mean net of 0.0
tiles and a mean reach of 0.0, cycling with `GO ROUTE` and `GO FRONTIER` over five tiles for seven
and a half brain minutes.
An errand's aim at a door carries no press -- the warp fires when it is stepped on -- so an aim on
the tile the fly is already standing on settles for `SETTLE_FRAMES` and reports `done` with the
world exactly as it was. A completed errand walk writes the reached ledger, which `goals_toward`
does not filter, so the same button was dealt on the next hold and the same nothing happened again.
`exit_goals` has excluded a settled goal underfoot since row 13; this is the one walk that did not
have the rule.
And the errand ledger is session state, so a restore re-armed every errand in the town and walked
the fly back to a counter it had already used. `map_visited` is the adapter's lifetime answer to
the same question and it does survive, so both are asked and either pays the errand.
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