sched: docs, probe retirement, MCP guard, coverage pins, executable example (T14)

src/wf_scheduling/poll.py

@@ -1,8 +1,9 @@
 """Poll loop: overlap, misfire, candidates, fairness, capacity (T08).
 
-Mirrors the reference state model (probes/deployment_scheduling_verify/
-test_schedule_state_model.py) against real file stores. Calendar iteration
-uses the canonical :class:`wf_scheduling.calendar.OccurrenceSource`
+Implements the scheduling state rules (first probed as a reference model,
+retired to docs/historical now that tests/scheduling/ pins them) against
+real file stores. Calendar iteration uses the canonical
+:class:`wf_scheduling.calendar.OccurrenceSource`
 (``next_after``/``prev_before`` only, never enumeration); latest-missed
 catch-up is one bounded ``prev_before`` query (F1). Overlap decisions
 precede capacity checks; terminal skips never reappear; ``latest`` retains