fix: respect user's --setting-sources in claude_args (#750)

When users specify --setting-sources in claude_args (e.g., '--setting-sources user'),
the action now respects that value instead of overriding it with all three sources.

This fixes an issue where users who wanted to avoid in-repo configs would still
have them loaded because the settingSources was hardcoded to ['user', 'project', 'local'].

Fixes #749

Co-authored-by: Ashwin Bhat <ashwin-ant@users.noreply.github.com>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>

base-action/src/parse-sdk-options.ts

@@ -249,10 +249,18 @@ export function parseSdkOptions(options: ClaudeOptions): ParsedSdkOptions {
     extraArgs,
     env,
 
-    // Load settings from all sources to pick up CLI-installed plugins, CLAUDE.md, etc.
+    // Load settings from sources - prefer user's --setting-sources if provided, otherwise use all sources
-    settingSources: ["user", "project", "local"],
+    // This ensures users can override the default behavior (e.g., --setting-sources user to avoid in-repo configs)
+    settingSources: extraArgs["setting-sources"]
+      ? (extraArgs["setting-sources"].split(
+          ",",
+        ) as SdkOptions["settingSources"])
+      : ["user", "project", "local"],
   };
 
+  // Remove setting-sources from extraArgs to avoid passing it twice
+  delete extraArgs["setting-sources"];
+
   return {
     sdkOptions,
     showFullOutput,