Add default marketplace for Claude Code and default to plan mode

Signed-off-by: Marcus Crane <marcus@utf9k.net>

Author: marcus-crane

dot_claude/settings.json

@@ -4,6 +4,14 @@
     "frontend-design@claude-plugins-official": true,
     "ralph-loop@claude-plugins-official": true
   },
+  "extraKnownMarketplaces": {
+    "claude-plugins-official": {
+      "source": {
+        "source": "github",
+        "repo": "anthropics/claude-plugins-official"
+      }
+    }
+  },
   "permissions": {
     "allow": [
       "Bash(git diff:*)",
@@ -16,6 +24,7 @@
       "WebFetch(domain:utf9k.net)",
       "WebSearch"
     ],
+    "defaultMode": "plan",
     "deny": [
       "Read(.env)",
       "Read(~/.aws/credentials)"