fix(api): adjust gate week handling to use campaign weeks

apps/api/src/stats.ts

@@ -10,6 +10,7 @@ import {
   addDays,
   campaignDay,
   campaignWeek,
+  isoWeek,
   streak,
 } from "./srs.ts";
 
@@ -61,9 +62,14 @@ export async function buildStats(db: D1Database, today: string): Promise<object>
   const ladder: Record<string, number> = { new: 0, "+2": 0, "+5": 0, "+10": 0, retired: 0 };
   for (const row of ladderRows) ladder[row.stage] = row.n;
 
-  const { results: gates } = await db
+  // gates rows are keyed by ISO week (that's the digest/gate contract), but
+  // the page speaks campaign weeks. The campaign never crosses a year
+  // boundary, so a plain offset converts safely.
+  const isoWeekOffset = isoWeek(CAMPAIGN_START) - 1;
+  const { results: gateRows } = await db
     .prepare("SELECT week, issue, pass_rate, closed_on FROM gates ORDER BY week")
     .all<{ week: number; issue: number | null; pass_rate: number | null; closed_on: string | null }>();
+  const gates = gateRows.map((g) => ({ ...g, week: g.week - isoWeekOffset }));
 
   // Review-queue depth for the next 14 days: everything due by that day.
   const queue: { date: string; due: number }[] = [];