Quote from PhanxI'd suggest using a more descriptive branch name (such as "zonespecific") but other than that it sounds fine. Feel free to copy my zone-specific debuff tracking stuff from GridStatusHealingReduced if you want.
I was thinking more along the lines of an alpha branch that continuing active development would go on, instead of just for a single feature. I can certainly go one-branch-per-feature, but I didn't want to excessively proliferate branches in the repository. But I will do whatever the developers here with more experience with this project and with WowAce feel is best practice.
And thanks for the permission to copy the debuff code from GridStatusHealingReduced. Most of that is directly reusable, which makes me wonder if perhaps that should go in a separate library by itself, and then used by both LibHealComm and your Grid addon, but that is a question for another day -- the code is small enough that duplicating it is a minor problem.