fix(medications): count forgotten doses as missed, not skipped

A never-acted dose past its 24h cutoff was flipped to skipped=true by the
hourly cron. The compliance engine excludes skipped doses from the
denominator (a deliberate user pause), so a forgotten dose then counted
neither as taken nor missed — silently inflating adherence.

Add a dedicated auto_missed terminal state. The cron now sets auto_missed
(not skipped) on a never-acted pending row, so the engine counts it as a
real miss against the rate, while a user-initiated skip stays excluded.
The two are mutually exclusive on a live row by construction.

prisma/schema.prisma

@@ -1443,6 +1443,14 @@ model MedicationIntakeEvent {
   scheduledFor   DateTime       @map("scheduled_for")
   takenAt        DateTime?      @map("taken_at")
   skipped        Boolean        @default(false)
+  /// v1.15.9 — distinguishes a never-acted forgotten dose from a
+  /// deliberate user skip. The hourly auto-miss cron sets this (NOT
+  /// `skipped`) on a pending row past its miss cutoff so the compliance
+  /// engine counts it as a MISS in the denominator, while a user-initiated
+  /// `skipped = true` stays excluded (a deliberate drug holiday). Every
+  /// legacy row defaults to false (a user skip or a live pending row,
+  /// neither of which is an auto-miss).
+  autoMissed     Boolean        @default(false) @map("auto_missed")
   source         IntakeSource   @default(WEB)
   idempotencyKey String?        @unique @map("idempotency_key")
   createdAt      DateTime       @default(now()) @map("created_at")