…ed subagent running

When a background run's report never reaches T3, the next report settles
the older call for that child and the resumed call stays running forever.
This test reproduces #26319 and fails on main.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

… running

A report now answers the child's newest call whose run has started, and
settles older open calls for that child as completed without the newer
report's text. Fixes #26319

Co-Authored-By: Claude Opus 5.5 <[email protected]>

…unning call

OpenCode 2 delivers a background subagent's report from a separate observer
after its job ends, so the report can arrive after the child's next run has
started. The previous fix settled the newest started call, which could be the
one still running. A report now only settles calls whose run has ended: calls
still awaiting their run and, while the child is busy, the current run's call
group are skipped.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

… running call

Skip the running group only when an older run is open to take the report;
otherwise settle it as main did, so a report that arrives before the child's
end event does not strand the call.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

A report carries no run id, so the busy-child heuristic misattributed a
resumed run's early report to an older call, and treated delayed reports as
proof that older ones were lost. OpenCode labels each run's report with the
description of the call that started it, so match on that instead. Open calls
for earlier runs complete without a result when a later run reports; an
unmatched report falls back to the oldest call as before.

AI-assisted; verified with the tests and tools listed above.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

OpenCode labels a run's report with the description of whichever call
registered the run's notification observer, which can be a call that joined
the running child rather than the one that started it. Match the report
against every call in a group, not only the group's root, so the earlier
group keeps its result instead of being treated as lost.

AI-assisted; verified with the tests and tools listed above.

Co-Authored-By: Claude Opus 5.5 <[email protected]>