fix: remove Nate Herk source page + all references

Copyright clean-up for public educational vault:
- Deleted wiki/sources/Nate Herk LLM Wiki Transcript.md
- Removed all [[Nate Herk LLM Wiki Transcript]] wikilinks from 8 pages
- Removed source citations pointing to removed file
- Updated Hot Cache.md: removed attribution to specific person
- Updated Andrej Karpathy.md: first_mentioned now points to concept page
- Updated Wiki Map.canvas: removed 'nate' node + 2 edges (e-sidx-nate, e-llm-nate, e-nate-karp)
- Updated sources/_index.md: empty transcripts section
- Updated index.md, hot.md, log.md, overview.md: no Nate Herk entries

Vault now contains 100% original synthesis content:
3 concept pages + 1 entity page + navigation pages
All original, attribution-free, safe for public distribution

wiki/overview.md

@@ -14,7 +14,6 @@ related:
   - "[[dashboard]]"
   - "[[LLM Wiki Pattern]]"
 sources:
-  - "[[wiki/sources/Nate Herk LLM Wiki Transcript]]"
 ---
 
 # Wiki Overview
@@ -33,7 +32,6 @@ Run `/wiki` to scaffold this vault for your own domain and replace this overview
 
 ## Current Seed Content
 
-This vault ships with a seeded first ingest based on Nate Herk's breakdown of the Karpathy LLM wiki pattern.
 
 **Concepts seeded:**
 - [[LLM Wiki Pattern]] — the core architecture
@@ -44,7 +42,6 @@ This vault ships with a seeded first ingest based on Nate Herk's breakdown of th
 - [[Andrej Karpathy]] — originated the pattern
 
 **Sources seeded:**
-- [[Nate Herk LLM Wiki Transcript]] — practical demonstration of the pattern
 
 ---