docs: remove all Nate Herk references from tracked files

- README.md: footer attribution + sources/ description
- ATTRIBUTION.md: removed Hot Cache & Cross-Project Patterns section
- wiki/getting-started.md: footer
- wiki/log.md: source reference
- wiki/meta/session note: inline mention

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

ATTRIBUTION.md

@@ -12,14 +12,6 @@ claude-obsidian is an original work. The following third-party patterns, tools,
 
 ---
 
-## Hot Cache & Cross-Project Patterns
-
-**Author:** Nate Herk
-**Channel:** https://youtube.com/@nateherk
-**Use:** The hot cache pattern (a rolling ~500-word context summary) and cross-project vault referencing were demonstrated by Nate Herk. claude-obsidian implements these patterns independently. No transcript or video content is included in this repository.
-
----
-
 ## ITS CSS Snippets
 
 **Author:** SlRvb