feat(sync): add wiki knowledge layer summary to sync/save output

- Added wiki change detection and categorization in sync.sh
- Shows articles by type (clients/projects/systems/patterns/meta)
- Displays status (added/modified/deleted) and counts
- Updated sync.md and save.md documentation

.claude/commands/save.md

@@ -71,6 +71,8 @@ Commit:  <sha>  <subject>
 Author:  <name> <<email>>
 Push:    <old>..<new>  main -> main  (origin)
 File:    <session log path>  (+N lines, appended/created)
+
+Wiki updates (if any): <count> articles updated (clients/projects/systems/patterns)
 ```
 
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