feat: CAPA overdue escalation cron — 4 thresholds, once-per-threshold via notifications_log

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFDuBhMKvoWjrWT3ZnGmmr

app/api/cron/capa-escalation/route.ts

@@ -0,0 +1,17 @@
+export const dynamic = 'force-dynamic'
+
+import { NextRequest, NextResponse } from 'next/server'
+import { createClient } from '@/lib/supabase/server'
+import { escalateOverdueCapa } from '@/lib/notifications/capa-escalation'
+
+export async function GET(request: NextRequest) {
+  const auth = request.headers.get('authorization')
+  const expected = `Bearer ${process.env.CRON_SECRET}`
+  if (!auth || auth !== expected) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  const supabase = await createClient()
+  const { notified } = await escalateOverdueCapa(supabase)
+  return NextResponse.json({ ok: true, notified })
+}