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

For each errored command, check whether the next command's
first_token_hash is in {man, help, info} (precomputed at module
load). At least one match → present, else absent. The --help / -h
flag forms aren't first tokens; v0.2 will reconsider once arg-token
hashing is justified by corpus.

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_fallback_to_man,
     error_resilience_frustration_typing,
     error_resilience_retry_tactic,
     exploration_style,
@@ -57,4 +58,5 @@ FEATURES: tuple[FeatureFn, ...] = (
     tool_vocabulary,
     error_resilience_retry_tactic,
     error_resilience_frustration_typing,
+    error_resilience_fallback_to_man,
 )