fix(copy): address PR #84 review — pacing, prerequisites, terminology

Review fixes for triangle activation monologue lines:

- CHANGELOG: correct smuggler line count (4 → 5), add D-035 ref
- Smuggler comment: align beat labels to 5-line structure
- Smuggler 040: "looking at" → "seeing" for body-first register
- Detective 043: rewrite to remove implicit manifest knowledge
  reference — line now works without fact prerequisite gate
- Detective 044: soften from near-certainty to enumerated
  possibilities with "insufficient data" qualifier
- Triangle comments: align to D-087 terminology (T1: Kael-
  Smuggler-Ring, T2: Sera-Detective-Commission)
- Schema description: note triangle_activated also missing from
  server Situation enum alongside greeting
- D-035 amendment: register triangle-signal, tell-observation
  tags and npc_in_los prerequisite as conventions

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

content/_schema/monologue-pool.schema.json

@@ -81,7 +81,7 @@
           },
           "minItems": 1,
           "uniqueItems": true,
-          "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."
+          "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' and 'triangle_activated' are not yet in server/src/content/line_pool.rs Situation enum."
         },
         "trigger": {
           "type": "string",