feat(profiler/behave_shell): G.4 operational.multi_actor_indicators

Compare median intra-command IATs of the two temporal halves of the
session. ≥ MULTI_ACTOR_HALF_MIN_COMMANDS (4) per half required;
relative delta > MULTI_ACTOR_HANDOFF_DELTA (0.5) → handoff_detected.

team_coordinated is Tier B (cross-session); never emitted from a
single session. Confidence 0.55 with both halves ≥ 8 commands; 0.40
otherwise.

decnet/profiler/behave_shell/_features/__init__.py

@@ -33,6 +33,7 @@ from decnet.profiler.behave_shell._features.environmental import (
 )
 from decnet.profiler.behave_shell._features.operational import (
     cleanup_behavior,
+    multi_actor_indicators,
     objective,
     opsec_discipline,
 )
@@ -89,4 +90,5 @@ FEATURES: tuple[FeatureFn, ...] = (
     objective,
     opsec_discipline,
     cleanup_behavior,
+    multi_actor_indicators,
 )