Fix terminal resize race (#2059)

packages/protocol/src/messages.create-terminal-size.test.ts

@@ -1,8 +1,8 @@
 import { describe, expect, it } from "vitest";
 import { CreateTerminalRequestSchema } from "./messages";
 
-// COMPAT(createTerminalSize): the size field is optional so old clients (which send no size)
-// still parse, and old daemons ignore it. These tests pin that contract.
+// The optional size field stays accepted permanently: released v0.1.107 clients send it, newer
+// app clients don't, and programmatic callers may. These tests pin that contract.
 describe("CreateTerminalRequest size", () => {
   const base = {
     type: "create_terminal_request" as const,

packages/protocol/src/messages.ts

@@ -2122,10 +2122,10 @@ export const CreateTerminalRequestSchema = z.object({
   agentId: z.string().optional(),
   command: z.string().optional(),
   args: z.array(z.string()).optional(),
-  // COMPAT(createTerminalSize): added in v0.1.107, drop the optional gate when floor >= v0.1.107.
-  // The client seeds the PTY with its measured viewport size so a new terminal isn't born at the
-  // 80x24 default and then visibly reflowed. Old daemons ignore this field and start at 80x24;
-  // the client's first resize corrects it as before.
+  // Initial PTY size. Added in v0.1.107; the app no longer sends it (the estimate cache that fed
+  // it was removed — the pane-focus resize claim sizes the PTY instead). Kept and honored
+  // permanently: released v0.1.107 clients still send it, and programmatic callers may pass an
+  // exact size. Daemons without it start at 80x24 and the first resize corrects that.
   size: z
     .object({
       rows: z.number().int().positive(),