huskies: merge 869

server/src/http/mcp/story_tools/story/update.rs

@@ -30,6 +30,14 @@ pub(crate) fn tool_update_story(args: &Value, ctx: &AppContext) -> Result<String
             front_matter.insert(k.clone(), v.clone());
         }
     }
+    // Intercept `qa` field — route through the typed CRDT register instead of YAML.
+    if let Some(qa_val) = front_matter.remove("qa") {
+        let mode = qa_val
+            .as_str()
+            .and_then(crate::io::story_metadata::QaMode::from_str);
+        crate::crdt_state::set_qa_mode(story_id, mode);
+    }
+
     let front_matter_opt = if front_matter.is_empty() {
         None
     } else {
@@ -37,7 +45,11 @@ pub(crate) fn tool_update_story(args: &Value, ctx: &AppContext) -> Result<String
     };
 
     let root = ctx.state.get_project_root()?;
-    update_story_in_file(&root, story_id, user_story, description, front_matter_opt)?;
+
+    // Only call update_story_in_file when there is something left to write.
+    if user_story.is_some() || description.is_some() || front_matter_opt.is_some() {
+        update_story_in_file(&root, story_id, user_story, description, front_matter_opt)?;
+    }
 
     // Bug 503: warn if any depends_on in the (now updated) story points at an archived story.
     let stage = crate::pipeline_state::read_typed(story_id)