effectful 0.3.0

Effect<A, E, R> (sync + async), context/layers, pipe — interpreter-style, no bundled executor
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# Services — The Complete DI Pattern

The previous chapters established the building blocks: Tags (identities), Context (the environment), and Layers (constructors). Now we put them together into the complete *Service* pattern.

A Service in effectful is the combination of:
1. A **trait** defining the interface
2. A **tag** identifying it in the environment
3. One or more **implementations** (production and test)
4. A **layer** that wires an implementation into the environment

This is the full dependency injection story. By the end of this chapter you'll have a working multi-service application wired entirely at compile time.