a controller that says nothing fails the hedge fixture by the deadline, not by an assertion naming the silence #971

In the same fixture (#952, theControllersWord in
internal/provider/hedge_test.go), a controller that never speaks is not
reported as a controller that never spoke. The lane holds its first word on a
channel that is never closed, the scenario runs to the test's deadline, and what
the reader gets is a timeout naming whichever test was running — the same shape
this pull request was written to remove everywhere else.

Proposal: the hold is bounded by the scenario's own patience, and the silence is
an assertion. theControllersWord (or the rig that hands it out) waits for the
word with a bound tied to the ceiling the scenario set rather than to the
package timeout, and on expiry fails with the sentence — something in the
register of "the controller never spoke: no rung of the waiting ladder was
reported before ", naming the last phase seen. Then a regression that
stops reporting fails on the claim it broke, in one line, instead of on a clock.

Raised by the provider owner's review of #952; deliberately left out of it
because it widens the change.

Drafted with CodeAF · reviewed and owned by the author