fp-guidelisted

# General Functional Programming Guidelines ## Core principles - Prefer module-level functions over classes; pass context explicitly; avoid inheritance. - Favor immutable data and pure functions; no global or shared mutable state. - Compose complex behavior from small, focused functions. ## Gotchas - Closures over mutable state look pure but aren't: referential transparency requires both inputs and captured environment to be immutable - Partial application order matters: `flip` exists because curry direction is opinionated, not arbitrary