Collapse the GET /api/agents/me/standup duplicate to one module

Two registrations of the same route lived in the codebase: one inline
in routes-agents.ts that filtered three full company-wide SELECTs in
memory, and the dedicated routes-agents-standup.ts that uses targeted
standup-shaped DB queries. The router keeps the first match so the
inline copy was serving every request and the focused module was dead
code — any future fix to standup would have silently missed
production.

Remove the inline standup handler and its three companion helpers
(`listAgentsForStandup`, `listTasksForStandup`, `listApprovalsForStandup`)
plus the unused `AgentStandupRow` type. The dedicated standup module is
now the single source of truth.

src/main/database/task-queries.ts

@@ -82,24 +82,6 @@ export function buildTaskQueryMethods(
       );
     },
 
-    /**
-     * 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,
-      );
-    },
-
     /**
      * Returns tasks filtered by status.
      */