fix(13-11): log per-scope permission denials instead of returning silently

On-device, an empty films search looked like a broken fetch. The console said
only "library: not permitted" — the content scopes returned null without a
word, so an ungranted Media/File permission was indistinguishable from "this
node genuinely has no films". That ambiguity cost real diagnosis time and sent
me looking for a code fault that was not there.

Each scope now names itself when denied. The permission was the whole cause;
no content path was broken.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

aiui/packages/app/src/composables/useArchy.ts

@@ -276,7 +276,19 @@ export function useArchy() {
       scopes.map((s) =>
         archyBridge
           .requestArchyContent('all', s)
-          .then((res) => (res.permitted ? res : null))
+          .then((res) => {
+            // Log the denial per scope. A silent null here is indistinguishable
+            // from "the node genuinely has no content", which is exactly the
+            // ambiguity that made an ungranted Media/File permission look like
+            // a broken films search on-device.
+            if (!res.permitted) {
+              console.warn(
+                `[AIUI Archy] content(${s}): not permitted — enable Media/File access in Archy Settings`,
+              )
+              return null
+            }
+            return res
+          })
           .catch((err) => {
             console.warn(`[AIUI Archy] content(${s}) failed:`, (err as Error)?.message ?? err)
             return null