jandelgado / jled / 29690040414 / 1

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master: 98%

Pull #175

github

docs: guide readers between JLedGroup and JLedRefGroup, drop deferred-feature promise

- add a "When to use what?" section to the group chapter, leading with
  JLedGroup as the default choice and framing JLedRefGroup around the
  decision that drives it: whether you already keep your LEDs as named
  variables. In that case a JLedGroup stores a second copy of every LED,
  so JLedRefGroup saves substantial RAM (measured on atmega328p, six named
  JLed objects: 198 bytes against 358).
- replace "per-element events are not yet supported" and "full-depth,
  per-leaf visibility is planned via a future per-element callback" with
  what readers can do today. Per-element events are deferred with no
  timeline, so the README should not promise them.
- show the supported way to react to a single LED inside a group: keep it
  as a named variable and watch IsRunning() across the Update() call.

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