APX Skills Are the Adoption Layer for APC
APC is the project contract. APX is the runtime layer that makes that contract usable today. The most practical bridge between both is APX skill installation.
That sounds small, but it solves a real adoption problem.
A protocol can be clean and still be ignored. If a tool does not know how to read .apc/, it will keep inventing its own local habits. One runtime may look at AGENTS.md. Another may ignore it. A third may store sessions in a vendor-specific cache and never touch the repo at all. APC only wins when the runtime learns to treat the repository contract as the source of truth.
That is where APX matters.
