WIP

crates/harness-core/src/engine/processor.rs

@@ -72,6 +72,8 @@ pub struct StepContext {
     /// Present in subagent sessions: reports read files to this session's job on the parent
     /// board. `None` for root sessions (nothing to report to).
     pub context_reporter: Option<Arc<dyn ContextReporter>>,
+    /// Language-server diagnostics source shared by the session's edit/write tool calls.
+    pub diagnostics: Option<Arc<dyn crate::lsp::DiagnosticsSource>>,
 }
 
 struct FlushTracker {
@@ -522,6 +524,7 @@ impl<'a> Run<'a> {
             metadata: metadata_sink,
             spawner: self.ctx.spawner.clone(),
             context_reporter: self.ctx.context_reporter.clone(),
+            diagnostics: self.ctx.diagnostics.clone(),
         };
 
         let result = tokio::select! {