_check_pm_decision_required now requires the latest journal:decision
within pm_decision_window_seconds (default 300). Older decisions no
longer satisfy the gate. Adds JournalService.latest_decision_at.
Future-tighten (out of scope): per-verb-group consumption tracking
would need persistent state — Choreographer is per-request today.
Smoke run 3 showed agents auto-pausing on i_am_idle (correct behavior
for non-terminal tasks) but capturing no checkpoint — panel's
Checkpoints column stayed empty. Pre-gateway parity: the auto-pause
path now writes a synthetic checkpoint summarizing state at pause-time
so the panel reflects reality.
Manual i_will_pause (G8a, deferred) will eventually let agents pass
their own checkpoint_summary; for now this synthetic write covers the
bare i_am_idle case which is what all current agents do.
Spec ref: docs/superpowers/specs/2026-05-12-post-smoke-3-fixes-design.md
section C7.