docs: align flow docs with code reality + create 35 implementation issue files

Flow docs updated (11 files):
- Delivery Confirmation: reversed actor roles (buyer generates, seller verifies),
  fixed endpoint paths (/delivery-code/generate, /delivery-code/verify)
- Passkey (WebAuthn): removed stub/simulated-key claims; real @simplewebauthn/server
  attestation is implemented; refresh tokens are persisted
- Dispute: corrected resolve schema (action enum), removed non-existent statuses,
  documented security gaps (no role guards on status/resolve/assign), route shadowing,
  all socket events are TODO stubs
- Seller Offer: corrected all endpoint paths, removed 'active' status, documented
  withdraw dead code, missing seller history page, select-offer notification gap
- Notification: corrected mark-all-read method+path, fixed GET /:id broken lookup,
  added unread-count-update socket event
- Authentication: corrected rate limiter (counts all attempts), axios 403 not handled,
  deleteAccount wrong endpoint bug, changePassword no UI
- Password Reset: corrected 6-digit code (not 8), documented no-complexity gap on
  reset-with-code vs token reset
- Payment Flow DePay: /create→/save, removed phantom sub-routes, SIM_ bypass risk,
  PaymentProvider type gap, getProviderIntentEndpoint routing bug
- Payment Flow SHKeeper: removed phantom polling endpoint, fixed release/refund paths
- Purchase Request: added pending_payment/active statuses, fixed sellers/attachments
  endpoints, corrected socket events, PUT→PATCH bug
- Escrow: documented dispute resolve does not touch escrow, route shadowing, confirm-delivery auth gap

Issues created (35 files in Issues/):
- 9 security issues (critical) including: dispute privilege escalation ×4,
  unauthenticated payment/scanner endpoints ×2, SIM_ production bypass,
  confirm-delivery ownership gap
- 26 additional major/critical bugs covering broken endpoints, missing features,
  data integrity gaps, and frontend-backend mismatches

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Issues/ISSUE-015-seller-offer-withdraw-no-http-route.md

@@ -0,0 +1,44 @@
+---
+issue: "015"
+title: "Seller offer withdraw has no HTTP route — withdrawOffer() service method is dead code"
+severity: major
+domain: seller-offer
+labels: [backend, missing-feature]
+status: open
+created: 2026-05-29
+source: Doc vs Code Audit 2026-05-29
+---
+
+# 🟠 Seller offer withdraw has no HTTP route — withdrawOffer() service method is dead code
+
+**Severity:** major
+**Domain:** seller-offer
+**Labels:** backend, missing-feature
+
+## Description
+
+`SellerOfferService.withdrawOffer()` (SellerOfferService.ts lines ~427-443) exists and implements withdrawal logic, but no HTTP route calls it. The documented `POST /api/marketplace/offers/:id/withdraw` endpoint does not exist in `routes.ts` or `marketplaceController.ts`.
+
+There is also no frontend `withdrawOffer()` action, no withdraw button in any seller step component, and no seller offers history page at `/dashboard/seller/marketplace/offers`.
+
+The only workaround is `PUT /api/marketplace/offers/:id/status` with `{ status: 'withdrawn' }`, which has no guard ensuring the requester is the offer's seller.
+
+## Current Behavior
+
+Sellers cannot withdraw their pending offers through any UI path. Withdrawing via `PUT /offers/:id/status` is the only API path and has no ownership guard.
+
+## Expected Behavior
+
+1. Wire a `POST /api/marketplace/offers/:id/withdraw` route to `SellerOfferService.withdrawOffer()`
+2. Add an ownership guard (only the offer's seller can withdraw)
+3. Add a frontend withdraw button and action
+
+## Affected Files
+
+- `backend/src/routes/routes.ts` — missing `POST /offers/:id/withdraw` route
+- `frontend/src/actions/marketplace.ts` — missing `withdrawOffer` action
+- Frontend seller dashboard — missing offers list page
+
+## References
+
+- [Doc vs Code Audit Report](../09%20-%20Audits/Doc%20vs%20Code%20Audit%20Report%20-%202026-05-29.md) — Findings C9, M26