feat: add startup status messages showing agent provenance (#147)

Co-authored-by: Letta <noreply@letta.com>

src/cli/components/StatusMessage.tsx

@@ -0,0 +1,41 @@
+import { Box, Text } from "ink";
+import { memo } from "react";
+import { useTerminalWidth } from "../hooks/useTerminalWidth";
+
+type StatusLine = {
+  kind: "status";
+  id: string;
+  lines: string[];
+};
+
+/**
+ * StatusMessage - Displays multi-line status messages
+ *
+ * Used for agent provenance info at startup, showing:
+ * - Whether agent is resumed or newly created
+ * - Where memory blocks came from (global/project/new)
+ *
+ * Layout matches ErrorMessage with a left column icon (grey circle)
+ */
+export const StatusMessage = memo(({ line }: { line: StatusLine }) => {
+  const columns = useTerminalWidth();
+  const contentWidth = Math.max(0, columns - 2);
+
+  return (
+    <Box flexDirection="column">
+      {line.lines.map((text, idx) => (
+        // biome-ignore lint/suspicious/noArrayIndexKey: Static status lines never reorder
+        <Box key={idx} flexDirection="row">
+          <Box width={2} flexShrink={0}>
+            <Text dimColor>{idx === 0 ? "●" : " "}</Text>
+          </Box>
+          <Box flexGrow={1} width={contentWidth}>
+            <Text dimColor>{text}</Text>
+          </Box>
+        </Box>
+      ))}
+    </Box>
+  );
+});
+
+StatusMessage.displayName = "StatusMessage";