Tidy up claude code file placement + permissions (#2281)

Author: hadley

.Rbuildignore

@@ -23,6 +23,5 @@
 ^[\.]?air\.toml$
 ^\.vscode$
 ^\.git-blame-ignore-rev$
-^CLAUDE\.md$
 ^\.claude$
 ^vignettes/articles$

CLAUDE.md renamed to .claude/CLAUDE.md

@@ -6,9 +6,7 @@
       "Bash(R:*)",
       "Bash(rm:*)",
       "Bash(air format:*)",
-      "Edit(R/**)",
-      "Edit(tests/**)",
-      "Edit(vignettes/**)"
+      "Edit(/**)",
     ],
     "deny": []
   }