Service is now a proper struct with OnStart/OnStop/OnReload lifecycle
functions — not a registry wrapping any. Packages create Service{} with
typed fields, same pattern as Command and Option.
Result drops generics — Value is any. The struct is the container,
Value is the generic. No more Result[T] ceremony.
Service(name, Service{}) to register, Service(name) to get — both
return Result. ServiceFactory returns Result not (any, error).
NewWithFactories/NewRuntime return Result.
232 tests, 77.8% coverage.
Co-Authored-By: Virgil <virgil@lethean.io>
164 tests, 41.3% coverage. Tests written against the public API only
(external test package, no _test.go in pkg/core/).
Covers: New(Options), Data, Drive, Config, Service, Error, IPC,
Fs, Cli, Lock, Array, Log, App, Runtime, Task.
Fixes: NewCommand now inits flagset, New() wires Cli root command.
Old tests removed — they referenced With*, RegisterService, and
other patterns that no longer exist.
Co-Authored-By: Virgil <virgil@lethean.io>
