checkpoint: calls/first-contact/stories fixes + Home/Messages redesign (unverified)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

engine/src/test/kotlin/io/flamenet/e2e/ContentTest.kt

@@ -198,4 +198,25 @@ class ContentTest {
             Attachment.open(sealed.blob, ref().copy(key = ByteArray(32), digest = sealed.digest))
         }
     }
+
+    /**
+     * 🔴 The vault persists refs through toJson and reads "exp" back out of
+     * that very JSON — a field toJson never wrote reloaded as 0, which both
+     * rendered every story as "no expiry" and (because 0 means immortal to
+     * isActive) meant expired story bytes were never dropped on write.
+     */
+    @Test
+    fun `a story ref keeps its expiry through the json round trip`() {
+        val posted = ref(kind = Attachment.STORY).copy(expires = 1_700_000_000.5)
+        val json = posted.toJson()
+        val reloaded = Attachment.Ref.fromJson(
+            Attachment.STORY, json, json.optDouble("exp", 0.0))!!
+        kotlin.test.assertEquals(posted.expires, reloaded.expires)
+    }
+
+    /** Non-story refs never grow an "exp" field they did not have before. */
+    @Test
+    fun `an image ref does not gain an expiry field`() {
+        assertFalse(ref().toJson().has("exp"))
+    }
 }