feat(profiler/behave_shell): emit temporal.lifecycle_markers.landing_ritual

Inspect the first N commands; if at least K of their first_token_hashes
match the recon-survey vocabulary (uname/id/whoami/pwd/hostname/w/who),
emit present, else absent. Hashes precomputed at module load; PII-safe.
v0.1 N=5, K=2.

decnet/profiler/behave_shell/_features/__init__.py

@@ -26,6 +26,7 @@ from decnet.profiler.behave_shell._features.cognitive import (
 )
 from decnet.profiler.behave_shell._features.temporal import (
     escalation_pattern,
+    landing_ritual,
     session_duration,
 )
 from decnet.profiler.behave_shell._features.motor import (
@@ -65,4 +66,5 @@ FEATURES: tuple[FeatureFn, ...] = (
     error_resilience_fallback_to_man,
     session_duration,
     escalation_pattern,
+    landing_ritual,
 )