diff --git a/backend/src/lib/config.ts b/backend/src/lib/config.ts
index 56ae40a..7388ad0 100644
--- a/backend/src/lib/config.ts
+++ b/backend/src/lib/config.ts
@@ -1,4 +1,5 @@
 import { z } from 'zod';
+import { PRODUCT_ID } from './product-config.js';
 
 const envSchema = z.object({
   PORT: z.coerce.number().default(4016),
@@ -11,7 +12,7 @@ const envSchema = z.object({
   COSMOS_DATABASE: z.string().default('bytelyst'),
   JWT_SECRET: z.string().min(1, 'JWT_SECRET is required'),
   DB_PROVIDER: z.enum(['cosmos', 'memory']).default('cosmos'),
-  PRODUCT_ID: z.string().default('bytelyst-notes'),
+  PRODUCT_ID: z.string().default(PRODUCT_ID),
   PLATFORM_SERVICE_URL: z.string().default('http://localhost:4003'),
   EXTRACTION_SERVICE_URL: z.string().default('http://localhost:4005'),
   MCP_SERVER_URL: z.string().default('http://localhost:4007'),
diff --git a/docs/roadmaps/08_ARCHITECTURE_REUSE_MASTER_ROADMAP.md b/docs/roadmaps/08_ARCHITECTURE_REUSE_MASTER_ROADMAP.md
index 67acca2..57c54b8 100644
--- a/docs/roadmaps/08_ARCHITECTURE_REUSE_MASTER_ROADMAP.md
+++ b/docs/roadmaps/08_ARCHITECTURE_REUSE_MASTER_ROADMAP.md
@@ -36,11 +36,11 @@ This roadmap tracks the execution work required to bring `learning_ai_notes` int
 
 # Phase R0 — Identity and Boundary Lock
 
-- [ ] Confirm `shared/product.json` is the canonical product identity source
-- [ ] Align web product identity defaults with `shared/product.json`
-- [ ] Align mobile product identity defaults with `shared/product.json`
-- [ ] Standardize auth storage prefixes across web and mobile
-- [ ] Standardize telemetry and diagnostics product tagging
+- [x] Confirm `shared/product.json` is the canonical product identity source
+- [x] Align web product identity defaults with `shared/product.json`
+- [x] Align mobile product identity defaults with `shared/product.json`
+- [x] Standardize auth storage prefixes across web and mobile
+- [x] Standardize telemetry and diagnostics product tagging
 - [ ] Document which code must remain product-local
 - [ ] Document which concerns must come from common platform packages/services
 
diff --git a/docs/roadmaps/09_BACKEND_REUSE_ALIGNMENT_ROADMAP.md b/docs/roadmaps/09_BACKEND_REUSE_ALIGNMENT_ROADMAP.md
index 8e0a580..7dd7326 100644
--- a/docs/roadmaps/09_BACKEND_REUSE_ALIGNMENT_ROADMAP.md
+++ b/docs/roadmaps/09_BACKEND_REUSE_ALIGNMENT_ROADMAP.md
@@ -36,10 +36,10 @@ Keep the backend strongly product-specific for notes domain logic while maximizi
 
 # Phase B0 — Identity and Config Alignment
 
-- [ ] Keep `shared/product.json` as the backend identity source
+- [x] Keep `shared/product.json` as the backend identity source
 - [ ] Ensure all persisted docs use the canonical product identity field
-- [ ] Review backend env schema for any duplicated or drifting product constants
-- [ ] Keep service URLs explicit for platform/extraction/MCP dependencies
+- [x] Review backend env schema for any duplicated or drifting product constants
+- [x] Keep service URLs explicit for platform/extraction/MCP dependencies
 
 # Phase B1 — Shared-Service Boundary Discipline
 
diff --git a/docs/roadmaps/10_WEB_REUSE_ALIGNMENT_ROADMAP.md b/docs/roadmaps/10_WEB_REUSE_ALIGNMENT_ROADMAP.md
index 4c64282..1d3616a 100644
--- a/docs/roadmaps/10_WEB_REUSE_ALIGNMENT_ROADMAP.md
+++ b/docs/roadmaps/10_WEB_REUSE_ALIGNMENT_ROADMAP.md
@@ -16,11 +16,11 @@ Make the web app the strongest notes authoring/operator surface while ensuring t
 
 # Phase W0 — Identity and Config Alignment
 
-- [ ] Align `web/src/lib/product-config.ts` with `shared/product.json`
-- [ ] Standardize auth storage prefix with backend/mobile identity
-- [ ] Standardize telemetry product tagging
-- [ ] Standardize diagnostics product tagging
-- [ ] Remove conflicting default `productId` values
+- [x] Align `web/src/lib/product-config.ts` with `shared/product.json`
+- [x] Standardize auth storage prefix with backend/mobile identity
+- [x] Standardize telemetry product tagging
+- [x] Standardize diagnostics product tagging
+- [x] Remove conflicting default `productId` values
 
 # Phase W1 — Auth and Platform Reuse
 
diff --git a/docs/roadmaps/11_MOBILE_REUSE_ALIGNMENT_ROADMAP.md b/docs/roadmaps/11_MOBILE_REUSE_ALIGNMENT_ROADMAP.md
index 2347788..3d6c98b 100644
--- a/docs/roadmaps/11_MOBILE_REUSE_ALIGNMENT_ROADMAP.md
+++ b/docs/roadmaps/11_MOBILE_REUSE_ALIGNMENT_ROADMAP.md
@@ -16,10 +16,10 @@ Make the React Native / Expo MVP follow the ByteLyst reuse-first path more stric
 
 # Phase M0 — Identity and Config Alignment
 
-- [ ] Align mobile config with `shared/product.json`
-- [ ] Remove hardcoded raw identity values where a canonical source can be used
-- [ ] Standardize auth storage prefix with web/backend
-- [ ] Standardize platform/product base URL strategy
+- [x] Align mobile config with `shared/product.json`
+- [x] Remove hardcoded raw identity values where a canonical source can be used
+- [x] Standardize auth storage prefix with web/backend
+- [x] Standardize platform/product base URL strategy
 
 # Phase M1 — Shared Client and SDK Alignment