docs(README): adjust heading levels in logging section

Promote "Logging" to H2 and change subheadings from H1 to H3 for improved Markdown structure and hierarchy.

README.md

@@ -116,18 +116,18 @@ Grokkit is designed to work seamlessly with Git, using version control instead o
 [Read the Safety & Change Management Guide](docs/user-guide/safety.md)
 
 
-### Logging
+## Logging
 
 Logs are written to `~/.config/grokkit/grokkit.log` in JSON format.
 
 
-# View logs in real-time
+### View logs in real-time
 `tail -f ~/.config/grokkit/grokkit.log`
 
-# Find errors
+### Find errors
 `cat ~/.config/grokkit/grokkit.log | jq 'select(.level=="ERROR")'`
 
-# Track API performance
+### Track API performance
 `cat ~/.config/grokkit/grokkit.log | jq 'select(.msg=="API request completed") | {model, duration_ms, response_length}'`