Add cross timeline interaction gym

docs/gyms/cross-timeline-interactions/gym_pattern7_text_input.dtl

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+# ============================================================
+# Pattern 7: Player Text Input Drives Next Timeline
+# ============================================================
+# The player types text that gets stored in a variable.
+# That variable then determines what happens next.
+# ============================================================
+
+label start
+
+join Miko center
+join Advisor right
+
+Advisor (pl5): This pattern captures player text input\
+and uses it to personalize the next timeline.
+
+Miko (smile): Let me ask you something...
+
+[wait time="0.5"]
+
+[text_input text="What is your name, traveler?" var="Gym.player_name" placeholder="Enter your name..." default="Hero" allow_empty="false"]
+
+Miko (joy): {Gym.player_name}? What a great name!
+
+[wait time="0.5"]
+
+Miko (neutral): Now watch — I can use your name to route you to\
+different content.
+
+if {Gym.player_name} == "Miko":
+    Miko (surprise): Wait... that's MY name!
+    Advisor (surprise): An impostor? Or a coincidence?
+    Miko (anger): I'll be watching you, {Gym.player_name}...
+elif {Gym.player_name} == "Hero":
+    Miko (smile): Classic choice. Very heroic!
+    Advisor (pl5): Predictable, but reliable.
+else:
+    Miko (joy): {Gym.player_name}, that's unique! I've never heard that before.
+    Advisor (pl5): A name to remember.
+
+[wait time="1.5"]
+
+Advisor (pl5): In a real game, the name would persist across ALL timelines.
+Advisor (pl5): You could reference `{Gym.player_name}` in any dialog.
+Miko (smile): NPCs could greet you by name, quest logs would use it...
+
+[wait time="1.0"]
+
+jump gym_main/menu