docs: align API reference and data model docs with code reality

API Reference (9 files updated):
- Marketplace API: corrected offer endpoints (scoped under /purchase-requests/:id/offers),
  marked phantom /search /stats /seller/:sellerId /withdraw routes as NOT IMPLEMENTED,
  documented PUT→PATCH mismatches, removed invalid SellerOffer 'active' status
- Dispute API: corrected resolve schema (action enum), categories (no 'fraud'),
  removed 'under_review' status, added security callouts (3 unguarded endpoints),
  route shadowing documented, all socket events marked as TODO stubs
- Notification API: corrected mark-all-read method+path, fixed broken GET /:id,
  added unread-count-update event, 90-day TTL documented
- Payment API: /create→/save, removed 10+ phantom endpoints, fixed release/refund
  paths (no /shkeeper/ segment), added 3 unauthenticated endpoint security warnings,
  stats undercounting documented, export privilege gap documented
- Authentication API: 8-digit→6-digit code, no-complexity warning on reset-with-code,
  rate limiter counts all attempts, passkey stub claims removed, deleteAccount bug noted
- Admin API: PUT→PATCH bug documented, wrong status values documented, hard vs soft
  delete clarified, scanner no-auth security bug, 3 NOT IMPLEMENTED endpoints
- Chat API: file upload wrong endpoint bug, archive PUT→PATCH bug, rate limits added
- Points API: corrected redeem schema, referral triggers on 'completed' only,
  leaderboard period ignored, removed 'refund' PointTransaction type
- Socket Events: removed request-cancelled, notification-read; added unread-count-update;
  dispute events all stubs; referral-signup is auth-domain not points-domain

Data Models (3 files updated):
- SellerOffer: removed 'active' from status enum, withdrawOffer() is dead code
- PurchaseRequest: added pending_payment/active statuses, added 'urgent' urgency,
  corrected description minimum (5 chars), removed finalized/archived
- Dispute: corrected action enum, categories (no fraud), removed under_review,
  security callout on unguarded status/resolve endpoints

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

02 - Data Models/SellerOffer.md

@@ -6,6 +6,8 @@ aliases: [Seller Offer, Bid, ISellerOffer]
 
 # SellerOffer
 
+> **Last updated:** 2026-05-29 — aligned with code (see [Doc vs Code Audit Report](../09%20-%20Audits/Doc%20vs%20Code%20Audit%20Report%20-%202026-05-29.md))
+
 A seller's bid against a [[PurchaseRequest]]. Stores the proposed price, the delivery time commitment, optional notes/attachments, and a small status machine (`pending` / `accepted` / `rejected` / `withdrawn`). The parent `PurchaseRequest` keeps the array of offer ids in `offers[]` and the chosen one in `selectedOfferId`.
 
 > [!note] Source
@@ -31,6 +33,8 @@ A seller's bid against a [[PurchaseRequest]]. Stores the proposed price, the del
 | `createdAt` | Date | auto | — | — | yes (desc) | Mongoose timestamp. |
 | `updatedAt` | Date | auto | — | — | — | Mongoose timestamp. |
 
+> **Status enum note:** Valid values are `pending | accepted | rejected | withdrawn` only. `'active'` is **not** a valid status and would throw a Mongoose `ValidationError` if passed.
+
 ## Virtuals
 
 None defined.
@@ -56,6 +60,16 @@ None defined.
 
 None defined.
 
+## Service notes
+
+### `createOffer` — eligible parent request statuses
+
+`createOffer` in `SellerOfferService` permits offers against a `PurchaseRequest` whose status is **`pending`**, **`received_offers`**, or **`active`**. Attempts against any other status are rejected.
+
+### `withdrawOffer()` — dead code
+
+`SellerOfferService.withdrawOffer()` exists in the source but is **not exposed via any HTTP route**. It cannot be called through the API. Any frontend references to a withdraw endpoint will receive a `404`.
+
 ## Relationships
 
 - **References**: [[User]] (`sellerId`), [[PurchaseRequest]] (`purchaseRequestId`).