fix(copy): remove v0.1 hand-authored content and detective mission system (#656, #657)

Delete 64 hand-authored Krenn dialogue/monologue/NPC files superseded
by generated NPCs (D-122) and voice pipeline (D-138). Remove detective
investigation system dropped in v0.2 pivot (D-117): knowledge catalog,
faction, design docs, workshop archives, wireframe detective sections.
Clean investigation.* fact_id references from environmental and triangle
files. Strip investigation cross-references from overheard.yaml.

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

content/npc-conversations/overheard.yaml

@@ -249,7 +249,7 @@ pairs:
     location_hints: [the-terminal]
     access: [public]
     trust: surface
-    knowledge_payload: "Container 4471 is being deliberately held in temp storage. 'Routing says hold' — someone modified the routing instruction. Cross-reference: investigation.container_delay."
+    knowledge_payload: "Container 4471 is being deliberately held in temp storage. 'Routing says hold' — someone modified the routing instruction."
     tags: [container-4471, routing, contraband-adjacent, investigation-payload]
 
   - id: overheard_014
@@ -329,7 +329,7 @@ pairs:
     location_hints: [the-terminal]
     access: [public]
     trust: surface
-    knowledge_payload: "Manifest weight discrepancy exists and dock workers are suspicious of the official explanation. Cross-reference: investigation.manifest_discrepancy."
+    knowledge_payload: "Manifest weight discrepancy exists and dock workers are suspicious of the official explanation."
     tags: [manifest, weight-discrepancy, contraband-adjacent, investigation-payload]
 
   - id: overheard_019
@@ -461,7 +461,7 @@ pairs:
     location_hints: [the-terminal, the-last-shift]
     access: [public]
     trust: surface
-    knowledge_payload: "Kael was in corridor B-7 off-shift. Eyewitness account. Cross-reference: investigation.kael_corridor_meeting."
+    knowledge_payload: "Kael was in corridor B-7 off-shift. Eyewitness account."
     tags: [kael, corridor-b7, investigation-payload, friend-arc, high-value]
 
   - id: overheard_027
@@ -477,7 +477,7 @@ pairs:
     location_hints: [the-last-shift]
     access: [public]
     trust: surface
-    knowledge_payload: "Kael met with an unidentified person at corridor B-7 during off-hours. Cross-reference: investigation.kael_unknown_contact."
+    knowledge_payload: "Kael met with an unidentified person at corridor B-7 during off-hours."
     tags: [kael, unknown-contact, corridor-b7, friend-arc, high-value, investigation-payload]
 
   - id: overheard_028
@@ -493,7 +493,7 @@ pairs:
     location_hints: [the-last-shift]
     access: [public]
     trust: surface
-    knowledge_payload: "Torek is spending significantly above his salary at The Last Shift. Cross-reference: investigation.torek_spending_pattern."
+    knowledge_payload: "Torek is spending significantly above his salary at The Last Shift."
     tags: [torek, spending, lera, investigation-payload, ring-adjacent]
 
   - id: overheard_029
@@ -621,7 +621,7 @@ pairs:
     location_hints: [the-last-shift]
     access: [public]
     trust: surface
-    knowledge_payload: "Kael's behavior has changed at home. Sleepless, secretive, won't explain to Naia. Cross-reference: behavioral.kael_behavioral_change, investigation.kael_attempting_exit."
+    knowledge_payload: "Kael's behavior has changed at home. Sleepless, secretive, won't explain to Naia. Cross-reference: behavioral.kael_behavioral_change."
     tags: [kael, naia, behavior, friend-arc, investigation-payload]
 
   - id: overheard_037
@@ -653,7 +653,7 @@ pairs:
     location_hints: [the-last-shift]
     access: [public]
     trust: surface
-    knowledge_payload: "Kael is actively trying to leave 'something' — most likely the ring. He's researching options. Cross-reference: investigation.kael_attempting_exit."
+    knowledge_payload: "Kael is actively trying to leave 'something' — most likely the ring. He's researching options."
     tags: [kael, exit, ring-adjacent, friend-arc, investigation-payload, high-value]
 
   - id: overheard_039
@@ -685,7 +685,7 @@ pairs:
     location_hints: [the-last-shift]
     access: [public]
     trust: surface
-    knowledge_payload: "Torek met with someone in the maintenance corridors late at night. Cross-reference: investigation.torek_ring_meeting."
+    knowledge_payload: "Torek met with someone in the maintenance corridors late at night."
     tags: [torek, maintenance, midnight, ring-adjacent, investigation-payload]
 
   # ===================================================================
@@ -785,7 +785,7 @@ pairs:
     location_hints: [the-last-shift]
     access: [public]
     trust: surface
-    knowledge_payload: "Sera is documenting something privately — possibly her own investigation or evidence she's sitting on. Cross-reference: investigation.sera_unreported_evidence."
+    knowledge_payload: "Sera is documenting something privately — possibly her own investigation or evidence she's sitting on."
     tags: [sera, naia, list, evidence, friend-arc, investigation-payload, dual-lens]
 
   - id: overheard_047