feat(lotus): io.lotus.call_summary — per-call quality readout at hangup (#143)

Tracks the local participant's LiveKit ConnectionQuality (time spent
poor/lost) and Reconnecting events for the life of the in-call view and
sends one io.lotus.call_summary { durationMs, reconnects, poorMs, verdict }
to the host on the first SFU disconnect or on teardown. Nothing is stored
or sent anywhere else. CallQualityTracker is pure and unit-tested.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/lotus/lotusActions.ts

@@ -46,6 +46,12 @@ export enum LotusWidgetActions {
    * toggle can reflect reality rather than the requested state.
    */
   DenoiseState = "io.lotus.denoise_state",
+  /**
+   * fromWidget: one-shot end-of-call readout for the local participant —
+   * `{ durationMs, reconnects, poorMs, verdict }` (#143) — sent on SFU
+   * disconnect or in-call teardown, whichever comes first.
+   */
+  CallSummary = "io.lotus.call_summary",
 }
 
 /** toWidget Lotus actions that must be allow-listed in `initializeWidget`. */