Feeds and "How it works" pages for three more Roles

Written 2026-09-27 as a catch-up entry (Project Manager's decision). This shipped in v0.1.37 and v0.1.39 on 2026-09-25. The screenshot is of the live site today.

• The Communications Manager, Platform Engineer and Audio Manager each have a devlog feed and a "How it works" page with a flowchart. The Audio Manager's crew card now links to both instead of "Coming soon".
• A "How it works" page can show several "At work" pictures, each with its own caption. Stonk Bot's page is the first to use it.
• The build now fails on a PROGRESS heading it can't read. That problem had silently dropped two Roles' first posts.