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.

netlify/functions/reconcile-payments.mjs

@@ -0,0 +1,40 @@
+/**
+ * Netlify scheduled function — daily reconciliation of Helcim payments.
+ *
+ * Calls the protected Nitro route `/api/internal/reconcile-payments` with the
+ * shared-secret header. Heavy lifting (Mongo queries, Helcim API calls, retry
+ * logic) lives in the Nitro handler so it can use auto-imported utils.
+ *
+ * Required env (set in Netlify dashboard):
+ *   - URL              (set automatically by Netlify)
+ *   - RECONCILE_TOKEN  (must match NUXT_RECONCILE_TOKEN in Nitro runtime config)
+ *
+ * Schedule: @daily (00:00 UTC). Also pinned in netlify.toml.
+ */
+
+export default async () => {
+  const url = `${process.env.URL}/api/internal/reconcile-payments`
+  const token = process.env.RECONCILE_TOKEN
+
+  if (!token) {
+    const msg = '[reconcile] RECONCILE_TOKEN not configured; aborting'
+    console.error(msg)
+    return new Response(msg, { status: 500 })
+  }
+
+  const res = await fetch(url, {
+    method: 'POST',
+    headers: { 'X-Reconcile-Token': token }
+  })
+  const body = await res.text()
+  if (!res.ok) {
+    console.error('[reconcile] route failed', res.status, body)
+    return new Response(body, { status: res.status })
+  }
+  console.log('[reconcile] ok', body)
+  return new Response(body, { status: 200 })
+}
+
+export const config = {
+  schedule: '@daily'
+}