refactor(api-server): move agents SQL into db.agents/db.activity/db.approvals methods

Replace seven inline queryAll calls in routes-agents.ts with typed
domain methods. db.agents gains listAgentsForApi, listAgentsForStandup,
listExistingAgentsForHireCheck. db.tasks gains listTasksForStandup.
db.approvals gains listApprovalsForStandup and
listPendingHireApprovalPayloads. db.activity gains listRecentTaskComments
(safe on empty taskIds). All HTTP response projections stay identical.

src/main/database/tasks-crud.ts

@@ -190,6 +190,24 @@ export function buildTaskCrudMethods(
       );
     },
 
+    /**
+     * Returns the slim task projection used by the me/standup aggregation.
+     * Ordered by created_at desc.
+     */
+    listTasksForStandup(companyId: string): Array<{
+      id: string;
+      companyId: string;
+      title: string;
+      assigneeAgentId: string | null;
+      status: string;
+      priority: string;
+    }> {
+      return readAll(
+        "select id, company_id as companyId, title, assignee_agent_id as assigneeAgentId, status, priority from tasks where company_id = ? order by created_at desc",
+        companyId,
+      );
+    },
+
     listTasksByStatuses(
       companyId: string,
       statuses: string[],