ORCA-903: regenerate @team-plain/graphql after isSuccess removal

.changeset/orca-903-drop-issuccess-from-schema.md

@@ -0,0 +1,9 @@
+---
+"@team-plain/graphql": minor
+---
+
+Regenerate against the current API schema. The API removed the deprecated `isSuccess` field from `ThreadDiscussionToolCallEntryPayload`, so it is gone from the bundled schema and from the exported type of the same name.
+
+**Nothing a caller reads off a response changes, and this is not a second break.** 3.0.0 already stopped selecting `isSuccess`, which removed it from the generated result types and shipped as a major. What is left to remove here is the last two traces: the bundled schema copy and the field on the exported `ThreadDiscussionToolCallEntryPayload` type. No document selected it, so no result type changes.
+
+That exported type is still public API, so code naming `ThreadDiscussionToolCallEntryPayload['isSuccess']` stops compiling with TS2339. Read `status` instead, a `DiscussionToolCallStatus` of `PENDING`, `SUCCESS` or `ERROR`. Do not translate the old boolean as `status === 'SUCCESS'` and stop: `false` covered a call that was still running as well as one that failed, so code treating every `false` as a failure was already mislabelling pending calls.

packages/graphql/src/_generated_documents.ts

@@ -14602,12 +14602,6 @@ export type ThreadDiscussionToolCallEntryPayload = {
   description: Scalars['String']['output'];
   durationMs: Scalars['Int']['output'];
   error?: Maybe<Scalars['String']['output']>;
-  /**
-   * True only when the call succeeded. A call still PENDING also reads false, so this
-   * boolean can no longer tell "not finished" from "failed". Use status for that.
-   * @deprecated Use status, which separates PENDING from ERROR.
-   */
-  isSuccess: Scalars['Boolean']['output'];
   op?: Maybe<Scalars['String']['output']>;
   /** Null on a call an agent reported: Plain has no name for it. */
   service?: Maybe<Scalars['String']['output']>;

packages/graphql/src/schema.graphql

@@ -1111,12 +1111,6 @@ type ThreadDiscussionToolCallEntryPayload {
 
   """Where the call is in its lifecycle."""
   status: DiscussionToolCallStatus!
-
-  """
-  True only when the call succeeded. A call still PENDING also reads false, so this
-  boolean can no longer tell "not finished" from "failed". Use status for that.
-  """
-  isSuccess: Boolean! @deprecated(reason: "Use status, which separates PENDING from ERROR.")
   error: String
   durationMs: Int!
 }