Adding telemetry events

The CLI has two telemetry types in internal/telemetry/:

• *telemetry.Collector — thread-safe event queue. Method: Record(event string, props map[string]any). This is what you pass into internal packages.
• *telemetry.Telemetry — orchestrator that holds a Collector + Sender + StatsRoundTripper, and is responsible for Flush() at process exit. Used at the cmd layer.

Two package-level vars are set up in cmd/rwx/root.go:

var (
    telem              *telemetry.Telemetry  // top-level, for cmd/rwx/*.go
    telemetryCollector *telemetry.Collector  // pass into internal packages
)

Event naming

Use dotted <area>.<action> names. Existing events: