admin/online room name is hardcoded in eight places

[josephfusco]

The admin/online room name is written as a string literal in eight places across six files:

• includes/heartbeat.php:32, :103, :311
• includes/user-list.php:26, :74
• includes/admin-bar.php:22
• includes/lifecycle.php:24
• includes/widgets/class-wp-presence-widget-whos-online.php:22 (as self::ROOM)

Per-post rooms already go through wp_presence_post_room(). Add wp_presence_admin_room() next to it and use it in all eight places.

Follow-up to #141, which added the third literal in heartbeat.php.

[oaksprout]

Would you want this one done? — Replacing the eight hardcoded copies of the room name with one shared helper, matching the per-post version. If yes, we'll do it and open a PR; if not, say so (or just ignore this) and we won't touch it.

How it works: an AI agent does the work against your write-up; it's independently checked in a clean container (your test suite, network off) before anything reaches you; a human reviews it, submits it, and answers the review. You keep full control — nothing lands unless you merge it.

Recent examples of the same flow on other projects: tinacms/tinacms#7328, nextcloud/tasks#3220, gramps-project/gramps-web#1320.

We're testing whether work offered this way is useful to maintainers — a blunt "no" is as helpful as a yes.

[josephfusco]

Closed by #176, releasing in v0.1.14.