feat(content): migrate line IDs to NPC-scoped namespace (D-035)

Line IDs in all dialogue and monologue pool files renamed from the
old location-scoped format (e.g. the-terminal_d_039) to the new
NPC-scoped format (e.g. kael-davan_d_001) per the D-035 Sprint 15
amendment.

Changes:
- 20 dialogue pool files across 3 locations renamed
- 14 monologue pool files (detective + smuggler) renamed
- Schema descriptions updated in dialogue/monologue schema files
- Authoring style guide and design docs updated with new examples
- Multi-location NPCs (kael-davan, pc-detective, pc-smuggler) given
  globally unique cross-file sequences to satisfy XREF uniqueness check

The location-scoped scheme already caused a collision (the-terminal_d_039
appearing in multiple NPC files) and would not scale to procedurally
generated NPC populations (D-029). Zero content changes — pure ID
substitution.

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

docs/design/npc-patterns/mirror-moment.md

@@ -226,7 +226,7 @@ Add `tags: [mirror_moment]` to both sides of every mirror pair so they can be id
 
 ```yaml
 # Smuggler side — monologue-smuggler.yaml
-- id: transit_m_s_044
+- id: pc-smuggler_m_s_044
   character: smuggler
   trigger: observe_npc
   prerequisite:
@@ -239,7 +239,7 @@ Add `tags: [mirror_moment]` to both sides of every mirror pair so they can be id
   tags: [mirror_moment, mirror_worried_partner]
 
 # Detective side — monologue-detective.yaml
-- id: transit_m_d_044
+- id: pc-detective_m_d_044
   character: detective
   trigger: observe_npc
   prerequisite:

docs/design/npc-patterns/the-mirror.md

@@ -359,7 +359,7 @@ skills:
 ```yaml
 # File: districts/{location}/dialogue/{role}-mirror.yaml
 
-- id: "{location}_d_001"
+- id: "{npc-slug}_d_001"
   text: "Greeting — warm, open, no guardedness"
   role: "{role}"
   access: ["public"]
@@ -367,7 +367,7 @@ skills:
   situation: ["greeting"]
   mood: ["warm"]
 
-- id: "{location}_d_002"
+- id: "{npc-slug}_d_002"
   text: "Sharing worry — direct, no evasion"
   role: "{role}"
   access: ["public", "insider"]
@@ -375,7 +375,7 @@ skills:
   situation: ["worried_inquiry"]
   mood: ["anxious"]
 
-- id: "{location}_d_010"
+- id: "{npc-slug}_d_010"
   text: "Deep emotional vulnerability — peer tier"
   role: "{role}"
   access: ["peer"]
@@ -385,8 +385,8 @@ skills:
 
 # Monologue content (separate per character, per D-032)
 
-# File: districts/{location}/monologue-smuggler.yaml
-- id: "{location}_m_s_001"
+# File: districts/{location}/monologue/smuggler/{location}.yaml
+- id: "pc-smuggler_m_s_001"
   text: "Smuggler feels guilt observing MIRROR's distress"
   character: "smuggler"
   trigger: "observe_npc"
@@ -394,8 +394,8 @@ skills:
     target.known_attributes.name: "{Name}"
     target.known_attributes.emotional_state: "worried"
 
-# File: districts/{location}/monologue-detective.yaml
-- id: "{location}_m_d_001"
+# File: districts/{location}/monologue/detective/{location}.yaml
+- id: "pc-detective_m_d_001"
   text: "Detective recognizes MIRROR as honest witness"
   character: "detective"
   trigger: "post_conversation"