Long-press message selection + delete (message.delete frame, outbox removal, all-device sync)

docs/protocol/frames.schema.json

@@ -42,6 +42,7 @@
       "message.start": { "payload": { "message_id": { "type": "string" }, "role": { "type": "string" } } },
       "message.update": { "payload": { "message_id": { "type": "string" }, "text": { "type": "string", "description": "Full current text (app replaces)." } } },
       "message.stop": { "payload": { "message_id": { "type": "string" }, "final_text": { "type": "string" }, "reasoning": { "type": "string" }, "model": { "type": "string" }, "tokens": { "type": "integer" }, "ts": { "type": "integer" } } },
+      "message.deleted": { "description": "The given message(s) were deleted from a chat/thread. Response to a message.delete request (id set) and broadcast to every device so all drop them from their cache; also outboxed so an offline device learns of the deletion on its next sync.", "payload": { "message_ids": { "type": "array", "items": { "type": "string" } } } },
       "commentary": { "description": "Intermediate assistant beat.", "payload": { "message_id": { "type": "string" }, "text": { "type": "string" } } },
       "tool.start": { "payload": { "index": { "type": "integer" }, "name": { "type": "string" }, "preview": { "type": "string" }, "args": { "type": "object" } } },
       "tool.progress": { "payload": { "index": { "type": "integer" }, "name": { "type": "string" }, "note": { "type": "string" } } },
@@ -77,6 +78,7 @@
       "search": { "payload": { "query": { "type": "string" }, "scope": { "type": "string", "enum": ["all", "chat"] }, "chat_id": { "type": "string" }, "thread_id": { "type": "string" }, "limit": { "type": "integer", "description": "Optional; server default 20." } } },
       "sync": { "description": "Reconnect catch-up; replays undelivered outbox frames only (not full history).", "payload": { "cursor": { "type": "integer" } } },
       "history": { "description": "Load a page of full message history for a chat/thread (initial open, scroll-up pagination).", "payload": { "before_message_id": { "type": "string", "description": "Return messages older than this (omit for newest page)." }, "limit": { "type": "integer", "description": "Max messages (default 50, max 200)." } } },
+      "message.delete": { "description": "Delete the given message(s) from a chat/thread. The server removes them from the outbox (so history/sync no longer return them) and broadcasts message.deleted to every device. Idempotent: a message already gone (pruned) still yields a message.deleted broadcast.", "payload": { "message_ids": { "type": "array", "items": { "type": "string" }, "description": "One or more message_id values to delete." } } },
       "fcm.register": { "payload": { "fcm_token": { "type": "string" }, "ntfy_topic": { "type": "string" } } },
       "ping": { "payload": { "ts": { "type": "integer" } } }
     }
@@ -105,7 +107,7 @@
   ],
   "reliability": {
     "ordering": "Per-connection (TCP/WS). message.update for a message_id is monotonic; app may coalesce to latest.",
-    "never_dropped": ["message", "message.stop", "tool.end", "notification", "channel.*", "search.results", "error"],
+    "never_dropped": ["message", "message.stop", "message.deleted", "tool.end", "notification", "channel.*", "search.results", "error"],
     "coalescable_under_backpressure": ["message.update", "tool.progress"],
     "offline": "Undelivered frames go to the outbox; replayed by sync. Terminal frames always outboxed."
   }