i'm not aware of existing resources for either of those unfortunately, other than possibly the Issues sections of each node's github repos

Are there any sites, GitHub repos, or other sources you can recommend for tracking known security issues in Lightning and the progress on efforts to address each? 

Similarly, is there a resource with a compatibility checker for the different LN node implementations, it would be great to know what features are available in which node implementation and the known issues using certain implementations together?

i would like to see more focus on ensuring all the node implementation remain compatible (sometimes there are weird issues where different node implementations have problems working together)

i also would like to see some solutions to the known attacks that exist on lightning

dannydeezy

bitcoin

AMA - Danny Diekroeger (Deezy Lightning)

In your opinion, what are some of the current challenges, tech, or proposals in the Lightning space (especially on the protocol side) that devs should prioritize to work on?