docs(cli): tighten Agent Mode wayfinding tip

Side benefit: this commit touches cli.mdx so Mintlify will redeploy
the page — its per-PR diff strategy missed the original PR #5152
update, leaving the live /platform/cli serving stale content with the
Plugin Sync section intact.

docs/platform/cli.mdx

@@ -26,7 +26,7 @@ pip install mem0-cli
 </CodeGroup>
 
 <Tip>
-**Looking for Agent Mode signup?** See [Sign up as an agent](/platform/agent-signup) — install, signup, first memory in four commands.
+**Are you an AI agent?** See [Sign up as an agent](/platform/agent-signup) — install, signup, and your first memory in four commands.
 </Tip>
 
 ## Authentication