fix(swarm-loc-guard): correct content extraction and IndiekitError constructor call

- rawContent extraction now handles normalized {html,text} object (content is
  already normalized by the time the guard runs, so String({...}) was '[object Object]')
- IndiekitError constructor is (message, options) not (status, message) — was
  passing 422 as message causing error.message=422 (number) which crashed the
  Nunjucks error template with 'Input data should be a String'

scripts/patch-micropub-swarm-loc-guard.mjs

@@ -29,11 +29,18 @@ const newSnippet = `    if (
       (hasCheckinProperty || hasSwarmSyndication)
     ) {
       // Guard: only accept OwnYourSwarm posts that contain "Loc" in content. ${MARKER}
-      const rawContent = Array.isArray(properties.content)
-        ? properties.content.join(" ")
-        : String(properties.content || "");
+      // Extract raw text before normaliseProperties converts content to {html,text} object.
+      // After normalisation, String(properties.content) yields "[object Object]" — not useful.
+      // We read .text/.html from the normalised object, then fall back to raw string.
+      const rawContent = (() => {
+        const c = properties.content;
+        if (!c) return "";
+        if (typeof c === "string") return c;
+        if (typeof c === "object") return String(c.text || c.html || "");
+        return String(c);
+      })();
       if (hasSwarmSyndication && !rawContent.includes("Loc")) {
-        throw new IndiekitError(422, "OwnYourSwarm post without 'Loc' in content rejected");
+        throw new IndiekitError("OwnYourSwarm post without 'Loc' in content rejected", { status: 422, code: "invalid_request" });
       }
       properties.visibility = "unlisted";
     }`;