- Implemented.

Replaced polling with a single queued cursor worker, timeout recovery, 
backoff, deduplication, chronological insertion, and capped DOM history 
in cyberchat-v4.js.
Removed Groups UI, API, configuration, tier features, admin controls, 
and archive exposure.
Legacy group records remain stored but inaccessible.
Added configurable polling limits in config.json.

README.md

@@ -1,6 +1,6 @@
 # CyberChat
 
-CyberChat is a framework-free PHP, SQLite, JavaScript, and HTML5 chat application with configurable paid tiers, Stripe subscriptions, Mailgun email verification, private groups, voice messages, personal archives, an administrator dashboard, and an optional MySQL/MariaDB mirror.
+CyberChat is a framework-free PHP, SQLite, JavaScript, and HTML5 chat application with configurable paid tiers, Stripe subscriptions, Mailgun email verification, voice messages, personal archives, an administrator dashboard, and an optional MySQL/MariaDB mirror.
 
 ## Included Features
 
@@ -10,12 +10,11 @@ CyberChat is a framework-free PHP, SQLite, JavaScript, and HTML5 chat applicatio
 - Stripe Checkout, Billing Portal, webhook synchronization, and cancellation
 - Configurable plans, prices, Stripe Price IDs, limits, and feature assignments
 - Subscription display switch that hides new sales while preserving billing management for existing customers
-- Globally configurable private groups with plan-based member limits, including the owner
 - Premium-configurable recording presence for both sending and viewing
 - Premium-configurable automatic voice sending
 - Tier-configurable automatic playback of newly received voice clips
 - Administrator tier overrides that grant plan features without payment
-- Resilient polling with stalled-request timeouts and post-send reconciliation
+- Single-worker queued polling with cursor catch-up, request timeouts, deduplication, bounded retry backoff, and a capped browser message buffer
 - Plan-based custom username colors
 - Personal text archives retained for at least 30 days
 - Plan-based voice archive access and JSON/CSV exports
@@ -64,8 +63,6 @@ The defaults are starting points and are fully editable in the dashboard.
 
 | Feature | Free | Plus | Pro |
 |---|---:|---:|---:|
-| Groups available | Yes | Yes | Yes |
-| Group members, including owner | 2 | 4 | 8 |
 | Recording status send/view | No | Yes | Yes |
 | Automatic voice send | No | Yes | Yes |
 | Automatic voice play | No | Yes | Yes |
@@ -75,12 +72,8 @@ The defaults are starting points and are fully editable in the dashboard.
 | Voice archive/export | No | Yes | Yes |
 | Email 2FA | No | Yes | Yes |
 
-Each tier has an explicit **Enable groups for this tier** toggle and a separate **Maximum People Per Group** value. The minimum is two people, including the group owner; disabling groups uses the toggle rather than a numeric value of zero.
-
 Administrators can assign a tier directly from **Admin > Users > Edit > Tier Override**. The override grants that tier's features without changing Stripe billing data and remains in effect until it is changed back to **Follow Stripe / billing status**.
 
-Private groups can be enabled or disabled globally under **Admin > Plans & Platform > Group Availability** or **Admin > Config > Feature Availability**. Each tier also has a **Groups Available** entitlement. Disabling either control hides group navigation and channels and blocks group API access without deleting existing groups or messages.
-
 ## Mailgun
 
 Configure these fields under **Admin > Plans & Platform**:
@@ -168,7 +161,6 @@ api/account.php              Email, color, and 2FA settings
 api/archive.php              Private personal archive and export
 api/auth.php                 Registration, login, 2FA, sessions
 api/billing.php              Stripe checkout, portal, and cancellation
-api/groups.php               Private group management
 api/messages.php             Text, voice, polling, and recording presence
 api/stripe-webhook.php       Stripe event synchronization
 assets/js/cyberchat-v4.js    Browser application