fix: resolve merge conflicts with main (Situation + Mood variants)

Keep all new variants from both branches: Greeting (copy), FirstMeeting
and RepeatedVisit (server). Combine Mood doc comments.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/bin/line_preview.rs

@@ -348,7 +348,8 @@ fn run_dialogue(index: &LinePoolIndex, args: &Args) {
                     "situation",
                     "arrival, shift_start, shift_end, shift_transition, bar_evening, \
                      night_shift, investigation, confrontation, social, alone, \
-                     emergency, routine, observation, greeting",
+                     emergency, routine, observation, greeting, first_meeting, \
+                     repeated_visit",
                 )
             })
             .collect()
@@ -597,6 +598,8 @@ fn situation_str(s: &Situation) -> &'static str {
         Situation::Routine => "routine",
         Situation::Observation => "observation",
         Situation::Greeting => "greeting",
+        Situation::FirstMeeting => "first_meeting",
+        Situation::RepeatedVisit => "repeated_visit",
     }
 }