sync: bug fixes + eval system from private repo

- Fix chunk_status: pass chunk_status/chunk/metadata to context builder
- Fix vector search: scope by node_id BEFORE similarity search
- Add eval logging system (RAH_EVALS_LOG=1)
- Add eval dashboard at /evals
- Add vitest for testing

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/layout/ThreePanelLayout.tsx

@@ -75,7 +75,10 @@ export default function ThreePanelLayout() {
         content: node.content,
         dimensions: node.dimensions,
         created_at: node.created_at,
-        updated_at: node.updated_at
+        updated_at: node.updated_at,
+        chunk_status: node.chunk_status,
+        chunk: node.chunk,
+        metadata: node.metadata,
       }));
       setOpenTabsData(validNodes);
     } catch (error) {