fix(schema): add missing dialogue mood and situation values

Adds 'focused' to mood enum and 'greeting' to situation enum in
dialogue-pool.schema.json. Both values are used by Sprint 7-8
dialogue content but were not added to the schema at the time.

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

content/_schema/dialogue-pool.schema.json

@@ -65,7 +65,8 @@
             "enum": [
               "arrival", "shift_start", "shift_end", "shift_transition",
               "bar_evening", "night_shift", "investigation", "confrontation",
-              "social", "alone", "emergency", "routine", "observation"
+              "social", "alone", "emergency", "routine", "observation",
+              "greeting"
             ]
           },
           "minItems": 1,
@@ -90,7 +91,8 @@
             "type": "string",
             "enum": [
               "fond", "comfortable", "worried", "suspicious",
-              "analytical", "conflicted", "concerned", "relieved"
+              "analytical", "conflicted", "concerned", "relieved",
+              "focused"
             ]
           },
           "uniqueItems": true,