feat(profiler/behave_shell): emit temporal.escalation_pattern

Bin commands into non-overlapping windows of width
max(ESCALATION_WINDOW_MIN_S, duration_s / ESCALATION_WINDOW_TARGET).
CV of per-window counts + zero-window fraction classify bursty /
sustained / erratic. v0.1; corpus re-tune deferred.

decnet/profiler/behave_shell/_features/__init__.py

@@ -25,6 +25,7 @@ from decnet.profiler.behave_shell._features.cognitive import (
     inter_command_latency_class,
 )
 from decnet.profiler.behave_shell._features.temporal import (
+    escalation_pattern,
     session_duration,
 )
 from decnet.profiler.behave_shell._features.motor import (
@@ -63,4 +64,5 @@ FEATURES: tuple[FeatureFn, ...] = (
     error_resilience_frustration_typing,
     error_resilience_fallback_to_man,
     session_duration,
+    escalation_pattern,
 )