docs: CHANGELOG covers MUTED pills / free space / loudest sort / snapshot-all / numpad / active-speaker highlight

CHANGELOG.md

@@ -210,6 +210,21 @@ For operators who want to launch TeamsISO and never look at the Teams UI:
   extracted from Teams' window title with brand suffix stripped.
 - **Auto-launch Teams + auto-hide windows** preferences for the headless
   "I only see TeamsISO" workflow.
+- **MUTED / CAM OFF pills** in the IN-CALL bar — UIA detects whether the
+  local user is muted or has their camera off, surfaces as coral pills.
+  Operator with auto-hide knows the local state without restoring Teams.
+- **Recording drive free space** in the footer (`· 245 GB free`). Coral
+  tint below 10GB; existing DiskSpaceWatcher still auto-disables at 1GB.
+- **Loudest sort mode** for the participants DataGrid + **active speaker
+  row highlight** (3px cyan left border + tinted background) on whoever's
+  speaking. Operators react to who's talking without scanning every VU bar.
+- **Snapshot all enabled participants** — header action saves every
+  enabled participant's current frame as a PNG into a fresh timestamped
+  subfolder under `%USERPROFILE%\Pictures\TeamsISO\snapshots-<ts>\`.
+- **NumPad 1-9 (and Digit 1-9) hotkeys** toggle the Nth visible
+  participant's ISO. Sort + filter aware — index matches what's on screen.
+  Generic `RelayCommand<T>` added to ViewModels/RelayCommand.cs so XAML
+  CommandParameter strings convert to the action's T.
 
 #### UI polish — visible affordances on the dark canvas
 - Hover state on every themed button (Ghost / Caption / RailIcon / IsoToggle)