Unit B (creator ruling 2026-11-12). Pressing Record / Go Live now changes the bar: the REC/ON-AIR pill
pair becomes two labelled switches with glyphs (the YouTube mark, the record dot), under an "Output"
label and beside "One output at a time". Build world shows nothing but its own segment.
Two things this exposed that were not cosmetic:
- **Local MP4 was not actually the default.** Both pills started unarmed, so the stage opened with no
output selected; the old screen got away with it because the primary button inferred "record" from
"nothing armed". RecordPillOn now starts true, which is what "pos = ON (default)" means in code.
- **The stage gates the whole idle cluster, not just the switch.** Gating only the switch left the start
button visible in the Build world — a Start with no output chosen. ShowOutputStage (output world, idle,
not recording) wraps the cluster, so a running session hides the stage too: its output cannot change.
Exclusivity stays in the view model (arming one drops the other); the XAML merely reflects it.
TopBarWorldTests pins the stage's visibility and the radio pair starting at Local MP4.
680 pass, 0 warnings. Next: unit C (output-dependent primary action, End labels).
Scope justification: Assets/starting-background.jpg is outside this unit — the creator's replacement art,
still awaiting their visual check.
gramps
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