claude/settings: suppress commit and PR attribution structurally

Adds the empty-string attribution block that disables Claude Code's
auto-added attribution lines (Co-Authored-By, 'Generated with Claude
Code', etc.) at the tool layer, matching the existing 'no Claude
attribution' rule in protocols.org.

Two complementary enforcement layers now:
- prompt-level rule (protocols.org)
- tool-level setting (this commit)

Same intent already lives in rulesets/languages/elisp/claude/settings.json
for elisp project bundles; this brings it to the global Claude Code
config that ships via archsetup.

1 files changed, 5 insertions, 1 deletions

diff --git a/dotfiles/common/.claude/settings.json b/dotfiles/common/.claude/settings.json
index d5c4231..aaf8b1b 100644
--- a/dotfiles/common/.claude/settings.json
+++ b/dotfiles/common/.claude/settings.json
@@ -13,5 +13,9 @@
   },
   "effortLevel": "high",
   "promptSuggestionEnabled": false,
-  "skipDangerousModePermissionPrompt": true
+  "skipDangerousModePermissionPrompt": true,
+  "attribution": {
+    "commit": "",
+    "pr": ""
+  }
 }