YuKu: 'slow the flicker a bit (half or one-third speed)'. The 16-colour
blue<->grey pulse now ticks at 150ms (600ms full cycle, calm); the
256-colour terminal breathe keeps its 50ms deep ramp. Per-depth tick
variable; same in the vendored helper.
Rate proven by pty trace: 8 frames in a 1.2s transaction = 150ms
exactly. (Frame-counting via grep -c undercounts — \r overwrites
collapse frames onto one line; count matches, not lines.)
Pathfinder
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