A child completion can wake the parent after its first completed turn. If
that summary cannot append turn/start or turn/end, AgentLoop reports an
agent/error and contains the rejected driver. Whole-agent idleness then
resolves, but the headless runner previously reused the older completed
terminal and exited successfully, sometimes printing the older answer.
Retain failures from the exact owned Agent with the current Session log
offset. Only a later terminal committed by the same Session clears that
failure. After work and persistence drain, fail the run before emitting a
final answer when no such terminal exists. Dispose both observers with
the run. Ordinary durable error outcomes and later successful recovery
continue to use the log's final terminal.
Add real AgentLoop regressions for missing summary start/end commits in
plain and JSON output, ordinary hook failures with and without recovery,
recovery after persistence failures, and unrelated Agent errors. Update
the bilingual exit contract and generated event consumer matrix.
Validation: 106 headless package tests; 100% runner statements, branches,
functions, and lines; 9 focused terminal-failure tests after the typed
append wrapper correction; package TypeScript build; full lint including
host build; 21 quick documentation checks; 42 doc-sync checks; diff check.
Tianyi Cui
b023791481