The fixture's hook commands were sh-only: single-quoted redirect targets
are literal under cmd /C, so the marker log never received content and
all six tests timed out on windows-latest. Build the marker command
per-platform — parenthesized `(echo MARKER)>> "log"` on Windows to
avoid cmd's trailing-space echo gotcha — and move the interpolated
paths into single-quoted YAML scalars so Windows backslashes are not
read as double-quoted-scalar escapes. Also replace the cleanup call
that a wait timeout skipped with a drop guard, so failed runs no
longer leak temp dirs.
The --macro dispatch arm now opens the top-level agent bracket before
macro_execute and closes it signal-aware afterwards, draining pending
hooks like the --execute arm; both bracket calls no-op without a loaded
agent, so agent-less macro runs are unaffected. The isolated arm of
macro_execute closes the bracket an in-macro .agent step opens on its
fresh context, on the step-failure path too. Binary-level tests pin
agent.started plus exactly one terminal event for the --agent flag and
for in-macro .agent steps in both isolation modes, on success and
failure.
Dark-Alex-17