Formalize plan for ECMA-402 updates dependent on UTS 35

[sffc]

In several issues recently, including #183, #437, and #581, we've made updates to ECMA-402 as a reaction to an update in UTS 35. Currently, the plan of action is to perform these updates on an ad-hoc basis. I would like the editors to discuss a sustainable plan as a path forward and document it.

[Boldgainobu]

In several issues recently, including #183, #437, and #584, 6we've made updates to ECMA-402 as a reaction to an update in UTS 35. Currently, the plan of action is to perform these updates on an ad-hoc basis. I would like the editors to discuss a sustainable plan as a path forward and document it.

[romulocintra]

Maybe a "How we work.md" would be ok

[sffc]

Discussion: be explicit in the spec that sections which depend on CLDR/Unicode are only kept in sync on a best-effort basis. These are two separate specs with two different lifecycles.