feat(copy): triangle activation proximity monologue lines (#597)

Author 4 smuggler and 5 detective monologue lines that fire when
the player observes triangle anchor NPCs post-TriangleActivated.

Smuggler (Kael Davan): physical observation → rationalization →
doubt → sensory confirmation. Contracted, personal, friend-arc.

Detective (Sera Venn/Torek): pattern recognition → deviation →
hypothesis → inference → procedural next step. Analytical,
institutional, evidence-cataloguing.

All lines: situation: [triangle_activated], trigger: observe_npc,
cooldown: 9999, priority: 8, prerequisite: npc_in_los: true.

Schema updated: triangle_activated added to situation enum,
npc_in_los added to prerequisites in monologue-pool.schema.json.

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

content/_schema/monologue-pool.schema.json

@@ -75,12 +75,13 @@
               "emergency",
               "routine",
               "observation",
-              "greeting"
+              "greeting",
+              "triangle_activated"
             ]
           },
           "minItems": 1,
           "uniqueItems": true,
-          "description": "D-035 structural tag: situations in which this monologue line is contextually appropriate. 14 v0.1 values. The engine selects using trigger; situation provides additional authoring context for filtering by the caller. NOTE: 'greeting' is not yet in server/src/content/line_pool.rs Situation enum."
+          "description": "D-035 structural tag: situations in which this monologue line is contextually appropriate. 15 v0.1 values (triangle_activated added Sprint 24). The engine selects using trigger; situation provides additional authoring context for filtering by the caller. NOTE: 'greeting' is not yet in server/src/content/line_pool.rs Situation enum."
         },
         "trigger": {
           "type": "string",
@@ -124,6 +125,10 @@
                       "enum": ["unknown", "known", "friendly", "person_of_interest", "hostile"]
                     }
                   }
+                },
+                "npc_in_los": {
+                  "type": "boolean",
+                  "description": "Gate: line only fires when the triggering NPC is in the player's line of sight. Added Sprint 24 for triangle_activated observe_npc lines."
                 }
               }
             }

content/campaigns/main/systems/krenn/stations/sova/districts/transit/monologue/detective/the-terminal.yaml

@@ -446,3 +446,77 @@ lines:
         state: person_of_interest
     priority: 8
     tags: [npc, kael, investigation, evidence, analytical]
+
+  # --- Triangle Activation: Sera Venn / Torek Lintar (T2 informant-question) ---
+  # Fires post-TriangleActivated when player has LOS to Sera or Torek. One beat per line.
+  # Beat 1: pattern recognition. Beat 2: deviation logged. Beat 3: hypothesis. Beat 4: inference. Beat 5: procedural next step.
+
+  - id: pc-detective_m_d_041
+    text: "Venn changed her transit route. Bay six to bay four bypass — three times today."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [suspicious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, sera, analytical]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-detective_m_d_042
+    text: "She passed Torek without acknowledgment. Third instance logged. They have worked adjacent bays for months."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [suspicious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, sera, torek, behavioral]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-detective_m_d_043
+    text: "If she knows about the manifest discrepancy, why has she not reported it?"
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [suspicious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, sera, analytical, friend-arc]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-detective_m_d_044
+    text: "She is protecting something. Or someone. The distinction matters."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [suspicious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, sera, analytical, friend-arc]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-detective_m_d_045
+    text: "Worth a direct conversation. Controlled setting. Not here."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [suspicious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, sera, procedural, friend-arc]
+    prerequisites:
+      npc_in_los: true

content/campaigns/main/systems/krenn/stations/sova/districts/transit/monologue/smuggler/the-terminal.yaml

@@ -373,3 +373,77 @@ lines:
         state: person_of_interest
     priority: 9
     tags: [npc, kael, contaminated-trust, friend-arc]
+
+  # --- Triangle Activation: Kael Davan (T1 hub-power) ---
+  # Fires post-TriangleActivated when player has LOS to Kael. One beat per line.
+  # Beat 1: physical observation. Beat 2: rationalization. Beat 3: doubt. Beat 4: doubt breaks.
+
+  - id: pc-smuggler_m_s_036
+    text: "Kael's in the main corridor. He doesn't usually come through here."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [suspicious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, kael, friend-arc]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-smuggler_m_s_037
+    text: "Voss probably moved him. Schedule shifts happen."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [suspicious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, kael, friend-arc]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-smuggler_m_s_038
+    text: "...Kael would've told me."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [anxious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, kael, friend-arc]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-smuggler_m_s_039
+    text: "He's not looking at the cargo. He's watching the exits."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [anxious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, kael, tell, friend-arc]
+    prerequisites:
+      npc_in_los: true
+
+  - id: pc-smuggler_m_s_040
+    text: "I don't know what I'm looking at. But I know Kael. And this isn't Kael."
+    role: player_character
+    access: [public]
+    trust: surface
+    situation: [triangle_activated]
+    trigger: observe_npc
+    mood: [anxious]
+    priority: 8
+    cooldown: 9999
+    tags: [triangle-signal, tell-observation, npc, kael, contradiction, friend-arc]
+    prerequisites:
+      npc_in_los: true