[phase-5] Telemetry endpoint now targets grouped historical series for graph rendering.

[sqlite] Data retention job prunes stale telemetry records on a fixed interval.

[ops] `sbl4` rollout still depends on restored SSH reachability from this workstation.

[ui] Charts use monotone splines, gradient strokes, and dark glass tooltips.

[edge] Cloudflare Pages deploys after the dashboard repo receives a push.

... live metrics continue streaming in the main panel ...