feat(cli): colorize gateway health + daemon output

src/commands/health-format.ts

@@ -0,0 +1,48 @@
+import { colorize, isRich, theme } from "../terminal/theme.js";
+
+const formatKv = (line: string, rich: boolean) => {
+  const idx = line.indexOf(": ");
+  if (idx <= 0) return colorize(rich, theme.muted, line);
+  const key = line.slice(0, idx);
+  const value = line.slice(idx + 2);
+
+  const valueColor =
+    key === "Gateway target" || key === "Config"
+      ? theme.command
+      : key === "Source"
+        ? theme.muted
+        : theme.info;
+
+  return `${colorize(rich, theme.muted, `${key}:`)} ${colorize(rich, valueColor, value)}`;
+};
+
+export function formatHealthCheckFailure(
+  err: unknown,
+  opts: { rich?: boolean } = {},
+): string {
+  const rich = opts.rich ?? isRich();
+  const raw = String(err);
+  const message = err instanceof Error ? err.message : raw;
+
+  if (!rich) return `Health check failed: ${raw}`;
+
+  const lines = message
+    .split("\n")
+    .map((l) => l.trimEnd())
+    .filter(Boolean);
+  const detailsIdx = lines.findIndex((l) => l.startsWith("Gateway target: "));
+
+  const summaryLines = (detailsIdx >= 0 ? lines.slice(0, detailsIdx) : lines)
+    .map((l) => l.trim())
+    .filter(Boolean);
+  const detailLines = detailsIdx >= 0 ? lines.slice(detailsIdx) : [];
+
+  const summary = summaryLines.length > 0 ? summaryLines.join(" ") : message;
+  const header = colorize(rich, theme.error.bold, "Health check failed");
+
+  const out: string[] = [`${header}: ${summary}`];
+  for (const line of detailLines) {
+    out.push(`  ${formatKv(line, rich)}`);
+  }
+  return out.join("\n");
+}