Biff.core: system composition for Clojure web apps

Jacob O'Bryant has released biff.core, the first library in Biff 2's modular redesign, which provides system composition and initialization functions for Clojure web applications. The library introduces "init functions" that extract boilerplate logic from application code, allowing libraries to be added via modules without requiring manual setup in the main namespace. To preserve late binding for dynamic updates without server restarts, init functions accept a var of modules rather than the modules themselves, with system map values implemented as functions that dereference and memoize results.