/routine passes a visible, replaceable target preselection (CL-7356)

CL-7355 already removed every invited-agent guard around routine
creation (CL-7357): DefinitionTargetPicker never auto-selects, and the
panel opens identically whether invoked from the routines page, the
palette, or a chat with no agents — there was nothing left to delete.

This wires DefinitionTargetPicker's existing preselectedAssetId prop
end to end: ChatWorkspace resolves the active workbench's agent
participants (already fetched for the failed-turn model picker) and,
only when there is exactly one, hands its definitionAssetId through
onCreateRoutineInSpace to RoutinePanelSubject.preselectedAssetId. The
picker shows it chosen but never disables changing or clearing it, and
only the person's final explicit selection is ever sent to
POST /routines — unchanged from CL-7355.

Author: TheGreatAxios

apps/web/src/pages/chat-page.tsx

@@ -306,8 +306,12 @@ export function ChatPage({
       // are global-only pages now, reached from the shell rail — no
       // per-workbench header button or `/run` command opens a scoped view
       // of either here.
-      onCreateRoutineInSpace={(inSpaceWorkbenchId) =>
-        openRoutine({ routineId: null, workbenchId: inSpaceWorkbenchId })
+      onCreateRoutineInSpace={(inSpaceWorkbenchId, preselectedAssetId) =>
+        openRoutine({
+          routineId: null,
+          workbenchId: inSpaceWorkbenchId,
+          ...(preselectedAssetId !== undefined ? { preselectedAssetId } : {}),
+        })
       }
       onWorkbenchNotFound={reportWorkbenchNotFound}
       onGoToMissionControl={() => navigate(MISSION_CONTROL_PATH)}

apps/web/src/shell/canvas-availability.tsx

@@ -64,6 +64,14 @@ export type RoutinePanelSubject = {
    * in which case the panel falls back to this workbench's own default
    * (Myra) workbench — never mints a new one. */
   readonly workbenchId?: string;
+  /** Seeds the target picker's initial selection (CL-7356) — the
+   * conversation's own single agent participant's definition asset id,
+   * when the opener could resolve exactly one. Shown visibly in
+   * `DefinitionTargetPicker` and freely replaceable/clearable by the
+   * person; only their final explicit pick is ever sent to the backend.
+   * Omitted whenever the opener found zero or several candidates, or has
+   * no conversation to derive one from at all. */
+  readonly preselectedAssetId?: string;
 };
 
 /** Workbench's concrete instantiation of `@corbits/shell-layout`'s generic

apps/web/src/shell/routine-panel.tsx

@@ -663,6 +663,9 @@ function RoutineEditorPanel({
             tenantId={tenantId}
             value={targetAssetId}
             onChange={pickTarget}
+            {...(subject.preselectedAssetId !== undefined
+              ? { preselectedAssetId: subject.preselectedAssetId }
+              : {})}
           />
         ) : (
           <div className="flex flex-col gap-1.5">

packages/chat-ui/src/chat-workspace.tsx

@@ -694,7 +694,10 @@ function ChatWorkspaceInner({
    * CL-6099) are global-only pages now — reached from the shell rail, not
    * a per-workbench header button or composer command.
    */
-  readonly onCreateRoutineInSpace?: (workbenchId: string) => void;
+  readonly onCreateRoutineInSpace?: (
+    workbenchId: string,
+    preselectedAssetId?: string,
+  ) => void;
   /** Fired when the routed workbench 404s — a deleted workbench, or a stale
    * Recents entry that outlived it. The host owns Recents (this package
    * never touches localStorage), so it's told rather than reaching out. */
@@ -1150,6 +1153,15 @@ function ChatWorkspaceInner({
         : Promise.resolve([]),
     enabled: activeWorkbenchId !== null,
   });
+  // `/routine`'s and "New routine in this space"'s optional preselection
+  // (CL-7356): exactly one agent participant hands its definition asset id
+  // straight to the routine panel's picker, visibly and replaceably — zero
+  // or several participants leave the picker with nothing chosen, same as
+  // opening it from `/routines` (CL-7357).
+  const singleWorkbenchAgentDefinitionAssetId: string | undefined =
+    workbenchAgentsQuery.data?.length === 1
+      ? workbenchAgentsQuery.data[0]?.definitionAssetId
+      : undefined;
   const failedTurnRecovery = useMemo((): FailedTurnRecovery => {
     const definitionIdByAddress: Record<string, string> = {};
     for (const agent of workbenchAgentsQuery.data ?? []) {
@@ -1720,7 +1732,10 @@ function ChatWorkspaceInner({
                           onCreateRoutineInSpace !== undefined &&
                           activeWorkbenchId !== null
                         ) {
-                          onCreateRoutineInSpace(activeWorkbenchId);
+                          onCreateRoutineInSpace(
+                            activeWorkbenchId,
+                            singleWorkbenchAgentDefinitionAssetId,
+                          );
                           return;
                         }
                         toast(CHAT_STRINGS.runRoutineUnavailable);
@@ -1855,7 +1870,10 @@ export function ChatWorkspace({
     tenantId: string,
   ) => Promise<readonly BringInMember[]>;
   /** "New routine in this space" — see `ChatWorkspaceInner`'s prop note. */
-  readonly onCreateRoutineInSpace?: (workbenchId: string) => void;
+  readonly onCreateRoutineInSpace?: (
+    workbenchId: string,
+    preselectedAssetId?: string,
+  ) => void;
   /** See `ChatWorkspaceInner`'s prop of the same name. */
   readonly onWorkbenchNotFound?: (workbenchId: string) => void;
   /** See `ChatWorkspaceInner`'s prop of the same name. */