Add cross timeline interaction gym

docs/gyms/cross-timeline-interactions/gym_pattern6_condition_router.dtl

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+# ============================================================
+# Pattern 6: Condition-Based Timeline Routing
+# ============================================================
+# Variable values automatically decide which timeline to run.
+# This is great for: time-of-day, reputation systems, quest states.
+# ============================================================
+
+label start
+
+join Miko center
+join Advisor right
+
+Advisor (pl5): This pattern routes to different timelines\
+based on variable values.
+
+Miko (neutral): Let's check the variables and see where we go...
+
+[wait time="1.0"]
+
+# These variables are set/cleared by the hub menu
+# and by exploring different patterns
+
+if {Gym.demo_flag}:
+    Miko (joy): `gym_demo_flag` is TRUE! You explored pattern 3.
+    Miko (smile): That means I'll route to the "explored" path.
+    jump gym_main/menu
+elif {Museum.met_merchant}:
+    Miko (neutral): You've met the merchant before!
+    Advisor (pl5): We'll take a different route for returning players.
+    jump gym_main/menu
+else:
+    Miko (doubt): No flags are set. This is your first time here.
+    Advisor (doubt): We'll take the default path.
+    jump gym_main/menu
+
+# In a real game, these would jump to different scene timelines:
+#   jump explored_content/
+#   jump returning_player/
+#   jump first_time/