Q173: agents work in the company's or task's language, not the display language

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/services/work-language.ts

@@ -0,0 +1,13 @@
+import type { DatabaseSync } from "node:sqlite";
+import type { WorkLanguage } from "../../shared/domain";
+
+/** The language agents work in on a task: the task's own, else its company's; the app's display language plays no part. */
+export function taskWorkLanguage(db: DatabaseSync, orgId: string, taskId: string): WorkLanguage {
+  const row = db.prepare(`
+    select coalesce(t.work_language, o.work_language) as language
+    from tasks t join organizations o on o.id = t.org_id
+    where t.id = ? and t.org_id = ?
+  `).get(taskId, orgId) as { language: WorkLanguage } | undefined;
+  if (!row) throw new Error("Task was not found.");
+  return row.language;
+}