fix(telemetry): only stitch oss identities with evidence of real oss usage

MemoryClient init fired PostHog $identify for anon ids the SDKs had minted
themselves (Python: setup_config() at import time; TS: getOrCreateMem0UserId()
inside the alias path), so ~90% of stitches merged event-less anon persons
into platform users, worst in ephemeral containers.

- never create the anon id from platform client paths; Python mints lazily in
  Memory/AsyncMemory init, gated on MEM0_TELEMETRY
- record telemetry.oss_used_at when OSS Memory genuinely initializes (both
  SDKs, shared ~/.mem0/config.json key) and only stitch the oss user_id when
  the marker is present; cli anon id stays presence-based
- stamp client_version on $identify so fixed-SDK stitches are separable from
  old-SDK noise in PostHog

mem0-ts/src/oss/src/memory/index.ts

@@ -39,7 +39,7 @@ import {
 } from "./memory.types";
 import { parse_vision_messages } from "../utils/memory";
 import { HistoryManager } from "../storage/base";
-import { captureClientEvent } from "../utils/telemetry";
+import { captureClientEvent, isTelemetryEnabled } from "../utils/telemetry";
 import { lemmatizeForBm25 } from "../utils/lemmatization";
 import {
   extractEntities,
@@ -53,7 +53,7 @@ import {
   ScoredResult,
 } from "../utils/scoring";
 import { getDefaultVectorStoreDbPath } from "../utils/sqlite";
-import { getOrCreateMem0UserId } from "../../../client/config";
+import { getOrCreateMem0UserId, markMem0OssUsed } from "../../../client/config";
 
 // Entity params that must be passed via filters - check both snake_case and camelCase
 const ENTITY_PARAMS = [
@@ -451,6 +451,12 @@ export class Memory {
     try {
       await this._getTelemetryId();
 
+      // Record genuine OSS usage so the platform client may stitch this
+      // machine's anon id to a platform email later.
+      if (isTelemetryEnabled()) {
+        await markMem0OssUsed();
+      }
+
       // Capture initialization event
       await captureClientEvent("init", this, {
         api_version: this.apiVersion,

mem0-ts/src/oss/src/utils/telemetry.ts

@@ -126,4 +126,8 @@ async function captureClientEvent(
   );
 }
 
-export { telemetry, captureClientEvent };
+function isTelemetryEnabled(): boolean {
+  return MEM0_TELEMETRY;
+}
+
+export { telemetry, captureClientEvent, isTelemetryEnabled };