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/hot.md

@@ -18,7 +18,6 @@ Navigation: [[index]] | [[log]] | [[overview]]
 ---
 
 ## Last Updated
-2026-04-07 — cosmic-brain v1.1.0 initialized. First ingest complete: Nate Herk LLM Wiki transcript.
 
 ## Key Recent Facts
 - The wiki pattern was originated by [[Andrej Karpathy]] and makes knowledge compound like interest
@@ -29,7 +28,6 @@ Navigation: [[index]] | [[log]] | [[overview]]
 
 ## Recent Changes
 - Created: [[LLM Wiki Pattern]], [[Hot Cache]], [[Compounding Knowledge]], [[Andrej Karpathy]]
-- Created: [[Nate Herk LLM Wiki Transcript]] (first source)
 - Created: seed vault structure (index, log, overview, dashboard)
 - Plugin v1.1.0: added /save and /autoresearch commands