fix(cli): stop dropping CI/agent telemetry, suppress HeyGen CI at workflow level

The CI=true early-exit in shouldTrack() was hiding most modern usage
(coding agents in Codespaces, CI pipelines, agent sandboxes). Remove it.
Each event still carries is_ci/is_docker/is_tty from system.ts, so CI vs
laptop traffic can be separated in PostHog without being dropped at
ingestion.

HeyGen's own CI is suppressed via HYPERFRAMES_NO_TELEMETRY=1 added to
each workflow that exercises the CLI.

packages/cli/src/telemetry/client.ts

@@ -40,11 +40,6 @@ export function shouldTrack(): boolean {
     return false;
   }
 
-  if (process.env["CI"] === "true" || process.env["CI"] === "1") {
-    telemetryEnabled = false;
-    return false;
-  }
-
   if (isDevMode()) {
     telemetryEnabled = false;
     return false;