feat(11-03): sync.ts derives reminderLeadMinutes from VALARM classification (D-07/NOTIF-05)

- Import classifyValarms from vevent.ts
- Derive reminderLeadMinutesValue: preset/offlist → leadMinutes; custom/none → null
- Add reminderLeadMinutes to .values() and .onDuplicateKeyUpdate({ set: {} })
- Scheduler now has ground truth for native-client VALARMs (T-11-07 mitigated)

apps/api/src/broker/sync.ts

@@ -22,6 +22,7 @@ import { and, eq, notInArray } from 'drizzle-orm';
 import { db } from '../db/client.js';
 import { calendars, calendarEvents } from '../db/schema.js';
 import type { EventChange } from '../lib/eventChangeDispatcher.js';
+import { classifyValarms } from './vevent.js';
 
 /**
  * Fetches all calendar objects for a given DAVCalendar, parses VEVENTs with ical.js,
@@ -128,6 +129,17 @@ export async function syncCalendar(
     const locationValue: string | null =
       (vevent.getFirstPropertyValue('location') as string | null) ?? null;
 
+    // Phase 11: derive reminderLeadMinutes from the VALARM classification (D-07, NOTIF-05).
+    // classifyValarms wraps ICAL.parse in try/catch (T-11-07 mitigated).
+    // preset/offlist → single relative lead in minutes (scheduler ground truth).
+    // custom (absolute DATE-TIME or multiple VALARMs) → null (can't resolve a single lead).
+    // none → null (no VALARM present).
+    const alarmClass = classifyValarms(obj.data as string);
+    const reminderLeadMinutesValue: number | null =
+      alarmClass.kind === 'preset' || alarmClass.kind === 'offlist'
+        ? alarmClass.leadMinutes
+        : null;
+
     // NOTIF-03: look up the existing row so we can classify add vs update.
     // One indexed lookup on (calendarId, uid) — cheap, covered by uniq_calendar_uid.
     // D-13: this read is from MariaDB cache, not Fastmail.
@@ -154,6 +166,8 @@ export async function syncCalendar(
         dtstartDate: dtstartDateValue,
         allDay,
         hasRrule: isRecurring,
+        // Phase 11: ground-truth VALARM lead for the scheduler (D-07/NOTIF-05, T-11-07)
+        reminderLeadMinutes: reminderLeadMinutesValue,
       })
       .onDuplicateKeyUpdate({
         set: {
@@ -165,6 +179,8 @@ export async function syncCalendar(
           dtstartDate: dtstartDateValue,
           allDay,
           hasRrule: isRecurring,
+          // Phase 11: keep reminderLeadMinutes current on re-sync (native client may change VALARM)
+          reminderLeadMinutes: reminderLeadMinutesValue,
           updatedAt: new Date(),
         },
       });