Disable Claude attributions in commits and prs

- We've been adjusting to Claude-enhanced development workflow for the past few months now, and these attributions are now more noise than a useful signal.
- Devs are assumed to be using Claude and other agentic assistance as a matter of course (just like we use IDEs) but are ultimately the humans "authoring" the change.

Author: amcclain

.claude/settings.json

@@ -48,5 +48,9 @@
             "mcp__jetbrains__search_in_files_by_regex",
             "mcp__jetbrains__search_in_files_by_text"
         ]
+    },
+    "attribution": {
+        "commit": "",
+        "pr": ""
     }
 }