revert: remove unrelated changes from previous commit

Restore .claude/settings.json and revert .gitignore change
that were accidentally included in the sdr-agent refactor commit.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/settings.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Edit|Write|NotebookEdit",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "ruff check --fix \"$CLAUDE_FILE_PATH\" 2>/dev/null; ruff format \"$CLAUDE_FILE_PATH\" 2>/dev/null; true"
+          }
+        ]
+      }
+    ]
+  }
+}

.gitignore

@@ -68,8 +68,6 @@ temp/
 exports/*
 
 .claude/settings.local.json
-.claude/skills/ship-it/
-.claude/settings.json
 
 .venv