feat(profiler/behave_shell): emit cognitive.error_resilience.retry_tactic

Modal response across Command.errored=True commands:
* same first_token_hash on next command → rerun
* different first_token_hash         → switch
* no next command                    → abort
Tiebreak in registry order. The fourth registry value 'modify'
requires within-command arg diffing (PII boundary); deferred to v0.2.

decnet/profiler/behave_shell/_features/__init__.py

@@ -14,6 +14,7 @@ from decnet.profiler.behave_shell._ctx import SessionContext
 from decnet.profiler.behave_shell._features.cognitive import (
     cognitive_load,
     command_branch_diversity,
+    error_resilience_retry_tactic,
     exploration_style,
     feedback_loop_engagement,
     planning_depth,
@@ -53,4 +54,5 @@ FEATURES: tuple[FeatureFn, ...] = (
     exploration_style,
     planning_depth,
     tool_vocabulary,
+    error_resilience_retry_tactic,
 )