fix(docs): updating the changelog, and removing cookbook page referencing graph memory (#4867)

docs/changelog/highlights.mdx

@@ -6,7 +6,7 @@ mode: "wide"
 
 <Update label="2026-04-14" description="Mem0 SDK v2.0.0 / v3.0.0">
 
-**New Memory Algorithm — State-of-the-Art Accuracy at 90% Lower Cost**
+**New Memory Algorithm — State-of-the-Art Accuracy at ~3-4x Lower Cost**
 
 Ground-up rewrite of the memory pipeline with 20+ point benchmark improvements:
 
@@ -15,7 +15,7 @@ Ground-up rewrite of the memory pipeline with 20+ point benchmark improvements:
 - **BEAM (1M tokens):** **64.1** — production-scale memory evaluation
 - **Agent memories are first-class** — Previous algorithm: 46% on assistant recall. New: **100%**
 - **Temporal reasoning works** — "Where did I live before SF?" Previous: 51%. New: **93%**
-- **90% fewer tokens** — Under 7K tokens per retrieval vs 25K+ for full-context approaches
+- **~3-4x fewer tokens** — Under 7K tokens per retrieval vs 25K+ for full-context approaches
 - **ADD-only extraction** — Memories accumulate; nothing is overwritten or deleted
 - **Hybrid retrieval** — Semantic + BM25 keyword + entity boost, scored in parallel
 - **Entity linking** — Entities extracted, embedded, and linked across memories

docs/changelog/platform.mdx

@@ -4,6 +4,13 @@ description: "Release notes for the Mem0 hosted platform — backend, dashboard,
 mode: "wide"
 ---
 
+<Update label="2026-04-16" description="">
+
+**Improvements:**
+- **UI:** Removed Graph Memory tab, page, and all references from dashboard, sidebar, project settings, playground, and billing
+
+</Update>
+
 <Update label="2025-07-23" description="">
 
 **Bug Fixes:**