Audit and fix NPC, door-staff and UI dialogue

- Route the Reason verb through authored reason contexts and give every shared archetype an in-character answer.
- Add Hollywood wristband and TV Studio ticket/credential door-staff lines.
- Clarify radio cancellation, Ask terminology, start hints and campaign-reset copy.
- Record the dialogue audit and length findings in docs/ui-copy.md; add regression tests.

src/core/npc_controller.gd

@@ -166,11 +166,10 @@ func decide_leave() -> bool:
 ## Level 3 ask: request the person's reason for entry (PLAN.md). Pure and
 ## headless-testable; returns the line this NPC answers with ("" if silent).
 func request_reason() -> String:
-	var lines: Array[String] = profile.dialogue_lines if profile else []
-	if lines.is_empty():
-		last_reason_reply = ""
-		return ""
-	last_reason_reply = lines[rng.randi_range(0, lines.size() - 1)]
+	# Prefer the authored "reason" context; profiles without one fall back to
+	# their general dialogue lines. Silence remains valid for a deliberately
+	# silent character.
+	last_reason_reply = profile.line_for("reason", rng) if profile else ""
 	return last_reason_reply
 
 ## Perception pass: given the guard's distance (meters), return a perception