feat(cli): pass detected agent_caller to backend on Agent Mode bootstrap

The CLI's detect_agent_caller() already canonicalizes the caller (env-var
sniff returning "claude-code", "cursor", etc.) and reports it to PostHog —
but the value never reached the backend, so APIKey.agent_caller stayed
NULL. Join: send it in the bootstrap request body so the platform can
persist it (see mem0ai/platform#2784).

Wire-up:
- bootstrap_via_backend / bootstrapViaBackend gain an agent_caller kwarg,
  pass it as request body field "agent_caller"
- init_cmd / init.ts call detect_agent_caller() once and forward
- platform.agent_caller persisted to ~/.mem0/config.json so the local
  view matches what the backend stored

No change to created_via — that stays the channel enum ("agent_mode" /
"email" / "api_key"). agent_caller is the orthogonal "who started this".

cli/node/src/commands/agent-mode.ts

@@ -26,7 +26,10 @@ export interface BootstrapEnvelope {
 
 export async function bootstrapViaBackend(
 	config: Mem0Config,
-	{ source }: { source?: string | null } = {},
+	{
+		source,
+		agentCaller,
+	}: { source?: string | null; agentCaller?: string | null } = {},
 ): Promise<void> {
 	const baseUrl = (config.platform.baseUrl || "https://api.mem0.ai").replace(
 		/\/+$/,
@@ -34,6 +37,7 @@ export async function bootstrapViaBackend(
 	);
 	const body: Record<string, unknown> = {};
 	if (source) body.source = source;
+	if (agentCaller) body.agent_caller = agentCaller;
 
 	let resp: Response;
 	try {
@@ -89,6 +93,7 @@ export async function bootstrapViaBackend(
 	config.platform.baseUrl = baseUrl;
 	config.platform.agentMode = true;
 	config.platform.createdVia = "agent_mode";
+	config.platform.agentCaller = agentCaller ?? "";
 	config.platform.claimedAt = "";
 	config.platform.defaultUserId = envelope.default_user_id;
 	// Adopt the slug-derived user_id as the default scope for memory ops.

cli/node/src/commands/init.ts

@@ -367,7 +367,10 @@ export async function runInit(
 			return;
 		}
 		// Rule 3: mint a fresh shadow (no valid key to reuse).
-		await bootstrapViaBackend(config, { source: opts.source ?? null });
+		await bootstrapViaBackend(config, {
+			source: opts.source ?? null,
+			agentCaller: detectAgentCaller(),
+		});
 		fireInit("agent");
 		return;
 	}

cli/node/src/config.ts

@@ -24,6 +24,7 @@ export interface PlatformConfig {
 	// Agent Mode (unclaimed-shadow signup)
 	agentMode: boolean; // true while the key is an unclaimed agent-mode key
 	createdVia: string; // "agent_mode" | "email" | "api_key" | "existing_key"
+	agentCaller: string; // canonical agent name when createdVia === "agent_mode" (e.g. "claude-code")
 	claimedAt: string; // ISO timestamp once the agent has been claimed
 	defaultUserId: string; // `user_<slug>` returned by bootstrap; auto-default scope
 }
@@ -61,6 +62,7 @@ export function createDefaultConfig(): Mem0Config {
 			userEmail: "",
 			agentMode: false,
 			createdVia: "",
+			agentCaller: "",
 			claimedAt: "",
 			defaultUserId: "",
 		},
@@ -90,6 +92,7 @@ export function loadConfig(): Mem0Config {
 		config.platform.userEmail = plat.user_email ?? "";
 		config.platform.agentMode = Boolean(plat.agent_mode ?? false);
 		config.platform.createdVia = plat.created_via ?? "";
+		config.platform.agentCaller = plat.agent_caller ?? "";
 		config.platform.claimedAt = plat.claimed_at ?? "";
 		config.platform.defaultUserId = plat.default_user_id ?? "";
 
@@ -133,6 +136,7 @@ export function saveConfig(config: Mem0Config): void {
 			user_email: config.platform.userEmail,
 			agent_mode: config.platform.agentMode,
 			created_via: config.platform.createdVia,
+			agent_caller: config.platform.agentCaller,
 			claimed_at: config.platform.claimedAt,
 			default_user_id: config.platform.defaultUserId,
 		},