The pulse has been implemented since 2026-08-30: authored/timing.json
looping_focus_records maps press_start/ptbtn00 -> ptbtn00f at period_units 120,
kind measured. The Decoder's independent figures (120 units, peak 80, ~51 of 60
frames) match the declared record on all three counts.
Verified rather than argued: 502 samples from a filmed boot folded onto the
declared 120-unit period reproduce the declared curve under ONE solved gain --
4.2% rms, with the flat top (phases 36-47, the alpha-80 plateau) and the flat
zero (108-119) both landing where declared. A sine of the same period fits 5.7x
worse, so it is the declared SHAPE and not just the period.
🔴 How I got it wrong: I measured 'does it return to dark'. It never does, BY
DESIGN -- the pulse is an additive glow over a base held at 255. I recorded an
11.6% ripple at a ~120-unit period, which WAS the pulse at exactly its declared
period, and attributed it to background leaking through my glyph mask.
I tested a property the feature was never supposed to have, and the authored
entry said so in its own words before I started. I read the disc's ptbtn00
keyframes, saw 244:0, and never read the port's own configuration for the element
I was measuring.
No code change. The arrival half of the page stands.
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