Type mixed buttons media headers and bounded carousels

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ## Unreleased
 
+- Interactive-message candidate (API PR #562, not deployed): Linked Devices
+  supports ten total buttons, up to three CTAs, mixed replies with URL/call
+  controls, image/video/document headers, and one 2–10-card image/video
+  carousel. Reply IDs and per-card controls are preserved. Copy/catalog controls
+  cannot mix with replies. Official API limits and approval remain separate.
+  Package publication requires the accepted API revision and matching staging.
+
 - Receipt-timed campaign follow-ups (beta). Messaging and Platform campaign
   create and update accept `followUp` (`CampaignFollowUp`): one text or
   template message sent from the first message's number, timed from its first

contracts/README.md

@@ -1,5 +1,14 @@
 # Contract coverage
 
+## Interactive message candidate
+
+`interactive-messages.json` pins button, carousel and list branches to draft API PR #562.
+Linked Devices accepts ten total controls and at most three CTAs. Replies can mix with URL/call; copy/catalog cannot mix with replies. Carousels contain 2–10 image/video cards with homogeneous controls within each card. Media headers and carousel payloads remain one send.
+Native list bounds follow the thirty-row contract; Official lists retain ten rows.
+Official API replies retain the three-button limit. SDK arrays preserve all
+parameters. Replace the draft pin with the accepted API revision and verify
+matching staging before package publication.
+
 ## Request log supplement
 
 `request-logs.json` pins `GET /platform/projects/{projectId}/request-logs` and