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>
