gitignore: exclude .claude/ settings and stray server binary

.claude/ holds machine-specific permission allowlists; /server is a
compiled artifact accidentally built at the repo root.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012MpK9niZm4jcs3mAJbxMfi

.gitignore

@@ -1,2 +1,4 @@
 .idea/
 .junie/
+.claude/
+/server