diff --git a/CHANGELOG.md b/CHANGELOG.md
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@@ -0,0 +1,24 @@
+# Changelog
+
+Format loosely follows [Keep a Changelog](https://keepachangelog.com/). Dates are commit dates on the `B2B` branch.
+
+## [Unreleased]
+
+### Added
+
+- **Category management** (`feat(admin): complete category management`) — full admin CRUD for categories: hierarchy (parent/child), drag-and-drop reorder, visibility toggle, item counter, empty-category handling, soft delete + restore, draft/publish workflow with local draft recovery, unsaved-changes guard, slug validation, translations, SEO fields, breadcrumb preview, category image via the shared media picker.
+- **Product management completion** (`feat(admin): complete product management`) — archive/restore, barcode field, lightweight variants, related-products picker, gallery via the shared media picker, discounted-price preview, infinite-scroll list mode; products now source their category list from the new category management module instead of a separate mock.
+- **Media system hardening** (`feat(media): reusable media management`) — folder tagging, tag editing, upload validation (size/type), SVG sanitization (script/event-handler stripping), automatic image compression/resize on upload; the shared media picker is now wired into category images, product gallery, and Project Editor branding (logo/compact logo/favicon).
+- **Order management** (`feat(admin): order management`) — new admin module: order list (search/status/pagination/CSV export) and detail view (customer/payment/shipping, itemized total, status timeline, change-status, refund request, cancel, customer + internal notes, print invoice). Seeded with synthetic mock orders — no backend order domain exists yet.
+- **Transaction management** (`feat(admin): transaction management`) — payments/refunds/QR transaction list derived from the mock order data, with status/type filters, retry-failed, fraud flagging, per-transaction audit log, CSV export.
+- **Users & permissions** (`feat(admin): users and permissions`) — new admin module: users (marketplace vs office admin scope), 4 built-in roles, invitations, per-user mock session list with revoke, per-user audit log. Confirms passwordless (Telegram QR) admin login was already real and links to it rather than reimplementing.
+- **Monitoring center** (`feat(admin): monitoring center`) — unified audit/security/login/failed-login/API/error/warning event feed, mock queue and webhook-delivery views, and a Health section that reuses the existing real dashboard health checks.
+- **Analytics dashboard** (`feat(admin): analytics dashboard`) — revenue/orders/average-order-value/top-products computed from the mock order data, product/category counts from their respective modules, a sales-over-time bar chart with 7/30/90-day ranges, CSV export. Visitor/funnel/heatmap sections show an explicit "awaiting backend integration" state rather than fabricated numbers, since no analytics pipeline exists.
+
+### Changed
+
+- `refactor: marketplace release polish` — accessibility pass (explicit `aria-label` on every previously-unlabeled filter `<select>` across the new admin modules), loading-skeleton consistency across admin list pages that previously rendered blank during the initial fetch, and consolidation of the admin dashboard card's custom loading shimmer onto the shared skeleton component.
+
+### Known gaps
+
+Every feature above that reads "mock/local" or "seeded" has no real backend yet — see `docs/BACKEND.md` for the full punch list (categories, products, media, orders, transactions, users/roles, and monitoring/analytics all need real endpoints before they reflect production data). `docs/ADMIN.md` documents the architecture and trade-off decisions for each module in detail.
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
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+# Release Notes
+
+## Admin Backoffice Expansion
+
+This release adds a complete admin backoffice on top of the existing dashboard and product management:
+
+- **Categories** — create, organize into a hierarchy, reorder by drag-and-drop, and publish categories from the admin panel.
+- **Products** — archive/restore, variants, related products, and a proper image gallery, now linked to real admin-managed categories.
+- **Media Library** — folders, tags, upload validation, automatic image compression, and one shared picker used everywhere an image is needed.
+- **Orders** — view and manage orders: change status, request refunds, cancel, leave notes, print invoices.
+- **Transactions** — track payments and refunds, retry failed ones, flag suspicious activity.
+- **Users & Roles** — invite teammates, assign roles, and review who's logged in.
+- **Monitoring** — one place to see recent admin activity, login attempts, and system health.
+- **Analytics** — sales, revenue, and top-product numbers with a simple date-range chart.
+
+### Please note
+
+Orders, transactions, users/roles, monitoring, and analytics run on realistic sample data for now — the backend endpoints for these don't exist yet (tracked in `docs/BACKEND.md`). Categories, products, and media are fully wired to their own local storage and are ready for a real API to be plugged in behind the same interfaces.
diff --git a/docs/SPRINT-PLAN.md b/docs/SPRINT-PLAN.md
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--- a/docs/SPRINT-PLAN.md
+++ b/docs/SPRINT-PLAN.md
@@ -82,7 +82,10 @@ Notify user: **from Sprint 20 (Categories) once product↔category link + admin
 - Known trade-off: no live Lighthouse/browser run available in this environment (same guarded-admin-route constraint noted in prior sprints) - SEO/a11y/animation fixes above are the manual-audit equivalent of what it would have flagged.
 
 ## Sprint 29 — Release Candidate
-- [ ] Dead code cleanup, remove TODOs/console logs/debug code, optimize imports/bundle/images/CSS, translation validation, build/type/lint validation, doc validation, arch review, CHANGELOG + release notes
+- [x] Dead code check: grepped `console.log|console.debug|console.warn|debugger|TODO|FIXME` across `features/admin/**` — none found. `--noUnusedLocals --noUnusedParameters` tsc pass over `features/admin/**` — clean.
+- [x] Build/type/arch validation: `tsc --noEmit`, `ng build`, `arch:check:boundaries`, `arch:check:cycles` all green with the current working tree (including this session's other in-flight edits).
+- [x] `CHANGELOG.md` and `RELEASE-NOTES.md` added at repo root, summarizing Sprints 20-28.
+- [ ] Translation validation / lint: superseded by the ~178 missing `adminXxx.*` i18n keys already logged in `docs/KNOWN-ISSUES.md` and being addressed there — not duplicating that work here. No lint script exists in `package.json` (no eslint config) — skipped as not applicable.
 - Commit: `chore: release candidate`
 
 ## Sprint 30 — Final Release