Set up Effect services architecture

Define typed services in Effect v4 with Context.Service and Layers

When defining services in Effect v4 with compile-time type safety and explicit dependency wiring.

• · service class definition
• · constructor effect
• · dependency list

• · Context.Service subclass
• · Layer.effect binding

• · Effect
• · TypeScript 5+

Effect v4 project; understanding of Effect.gen and Layer composition

• · Using string literals instead of IdentityComposer $I tags (loses compile-time validation)
• · shape type mismatch between class and service
• · Layer.provide order matters for dependency resolution

• · IdentityComposer key validation at runtime
• · class nominal typing prevents accidental mix-ups
• · Layer composition example provided