feat(cli): Agent Mode bootstrap + claim flow (Python + Node) (#5123)

cli/node/src/telemetry.ts

@@ -115,6 +115,9 @@ export function captureEvent(
 			}
 		}
 
+		// M4: every cli.* event carries agent_mode based on the config flag
+		// (unclaimed Agent Mode key). This is the growth-doc property used to
+		// join init → add → search funnels in PostHog.
 		const payload = {
 			api_key: POSTHOG_API_KEY,
 			distinct_id: distinctId,
@@ -123,6 +126,7 @@ export function captureEvent(
 				source: "CLI",
 				language: "node",
 				cli_version: CLI_VERSION,
+				agent_mode: Boolean(config.platform.agentMode),
 				node_version: process.version,
 				os: process.platform,
 				...properties,