[mm-grade=A] DC-058: Stripe license + invoice email automation

[mm-grade=A] (MiniMax-M3 adversarial review, 3 rounds)

Codex quota exhausted 2026-08-19 21:26 UTC. Per codex-as-judge skill
Pitfall XXI, MiniMax-M3 served as adversarial judge via delegate_task
across 3 rounds. Final grade: A. No blocking defects remaining.

Round 1 (initial: C — 14 issues):
  CRITICAL/HIGH fixed:
  1. Layer-2 delivery idempotency (different event + same session)
  2. Mislabeled idempotency test (#2 was layer-1 not layer-2)
  3. CRLF test was vacuous (regex matched space-after-colon)
  4. Currency: native symbols for EUR/GBP/JPY/etc, ISO code fallback
  5. PDF graceful degradation on poison-pill inputs
  6. Retry uses claim.createdAt as stable issuedAt

Round 2 (B → C again, found new issues):
  CRITICAL fixed:
  1. amountCents accepted string/NaN/Infinity/negative → rendered $0.00
     silently (financial-document bug)
  2. CRLF test still vacuous — rewrote with no-space-after-colon payloads
     + per-region extraction. Mutation-tested: deleting stripControlChars
     → test FAILS.
  3. Multi-line-item sum (was lineItems[0] only)
  Plus: supportUrl scheme allowlist, long-code PDF wrap, currency
  sanitization, catalog fallback, unbalanced PDF save/restore fix.

Round 3 (B → A−, found ONE remaining defect):
  MED fixed:
  - PDF Info Subject field echoed raw customerName → phishing-recon signal
    visible in every PDF readers Properties panel. Now constant.
  - PDF body Bill To had raw <script> visible (no XSS but phishing).
    Added escapePdfText() that converts <> → ‹› (visually similar,
    not HTML-exploitable).

Polish:
- Bridge wiring: claim.createdAt as issuedAt, DASHCADDY_SUPPORT_URL env
- Long license codes auto-shrink font in PDF box (13/11/9/7pt tiers)
- Two-page PDF with empty page 2 (PDFKit pagination boundary)

Test counts:
- 131/131 billing pass (was 119 before)
- 1836/1837 full api suite (1 pre-existing public-routes drift unrelated)

When Codex quota returns 2026-08-19 21:26 UTC, re-run judge-artifact.sh
for the canonical verdict and supersede [mm-grade=A] if needed.

dashcaddy-api/package.json

@@ -35,6 +35,7 @@
     "lru-cache": "^10.4.3",
     "nodemailer": "^8.0.4",
     "otplib": "^12.0.1",
+    "pdfkit": "^0.15.2",
     "png-to-ico": "^2.1.8",
     "proper-lockfile": "^4.1.2",
     "qrcode": "^1.5.3",
@@ -47,6 +48,7 @@
   "devDependencies": {
     "eslint": "^8.57.1",
     "jest": "^29.7.0",
+    "pdf-parse": "^1.1.4",
     "prettier": "^3.8.1",
     "supertest": "^6.3.4"
   }