feat(launch): security and correctness fixes for 2026-05-01 launch

Day-of-launch deep-dive audit and remediation. 11 issues fixed across
security, correctness, and reliability. Tests: 698 → 758 passing
(+60), 0 failing, 2 skipped.

CRITICAL (security)

Fix #1 — HELCIM_API_TOKEN removed from runtimeConfig.public; dead
useHelcim.js deleted. Production token MUST BE ROTATED post-deploy
(was previously exposed in window.__NUXT__ payload).

Fix #2 — /api/helcim/customer gated with origin check + per-IP/email
rate limit + magic-link email verification (replaces unauthenticated
setAuthCookie). Adds payment-bridge token for paid-tier signup so
users can complete Helcim checkout before email verify. New utils:
server/utils/{magicLink,rateLimit}.js. UX: signup success copy now
prompts user to check email.

Fix #3 — /api/events/[id]/payment deleted (dead code with unauth
member-spoof bypass — processHelcimPayment was a permanent stub).
Removes processHelcimPayment export and eventPaymentSchema.

Fix #4 — /api/helcim/initialize-payment re-derives ticket amount
server-side via calculateTicketPrice and calculateSeriesTicketPrice.
Adds new series_ticket metadata type (was being shoved through
event_ticket with seriesId in metadata.eventId).

Fix #5 — /api/helcim/customer upgrades existing status:guest members
in place rather than rejecting with 409. Lowercases email at lookup;
preserves _id so prior event registrations stay linked.

HIGH (correctness / reliability)

Fix #6 — Daily reconciliation cron via Netlify scheduled function
(@daily). New: netlify.toml, netlify/functions/reconcile-payments.mjs,
server/api/internal/reconcile-payments.post.js. Shared-secret auth
via NUXT_RECONCILE_TOKEN env var. Inline 3-retry exponential backoff
on Helcim transactions API.

Fix #7 — validateBeforeSave: false on event subdoc saves (waitlist
endpoints) to dodge legacy location validators.

Fix #8 — /api/series/[id]/tickets/purchase always upserts a guest
Member when caller is unauthenticated, mirrors event-ticket flow
byte-for-byte. SeriesPassPurchase.vue adds guest-account hint and
client auth refresh on signedIn:true response.

Fix #9 — /api/members/cancel-subscription leaves status active per
ratified bylaws (was pending_payment). Adds lastCancelledAt audit
field on Member model. Indirectly fixes false-positive
detectStuckPendingPayment admin alert for cancelled members.

Fix #10 — /api/auth/verify uses validateBody with strict() Zod schema
(verifyMagicLinkSchema, max 2000 chars).

Fix #11 — 8 vitest cases for cancel-subscription handler (was
uncovered).

Specs and audit at docs/superpowers/specs/2026-04-25-fix-*.md and
docs/superpowers/plans/2026-04-25-launch-readiness-fixes.md.
LAUNCH_READINESS.md updated with new test count, 3 deploy-time
tasks (rotate Helcim token, set NUXT_RECONCILE_TOKEN, verify
Netlify scheduled function), and Fixed-2026-04-25 fix log.

app/components/SeriesPassPurchase.vue

@@ -144,6 +144,7 @@
           <p class="text-xs text-[--ui-text-muted] text-center">
             By registering, you'll be automatically registered for all
             {{ seriesInfo.totalEvents }} events in this series.
+            <span v-if="!isLoggedIn"> We'll create a free guest account so you can access your pass.</span>
           </p>
         </form>
       </div>
@@ -182,7 +183,7 @@ const props = defineProps({
 const emit = defineEmits(["purchase-success", "purchase-error"]);
 
 const toast = useToast();
-const { initializeTicketPayment, verifyPayment } = useHelcimPay();
+const { initializeSeriesTicketPayment, verifyPayment } = useHelcimPay();
 
 // State
 const loading = ref(true);
@@ -264,10 +265,9 @@ const handleSubmit = async () => {
       paymentProcessing.value = true;
 
       // Initialize Helcim payment for series pass
-      await initializeTicketPayment(
+      await initializeSeriesTicketPayment(
         props.seriesId,
         form.value.email,
-        passInfo.value.ticket.price,
         props.seriesInfo.title,
       );
 
@@ -298,6 +298,11 @@ const handleSubmit = async () => {
       }
     );
 
+    // Refresh client auth state if server signed us in (guest upgrade)
+    if (purchaseResponse?.signedIn) {
+      await useAuth().checkMemberStatus();
+    }
+
     // Show success message
     toast.add({
       title: "Series Pass Purchased!",