Replace separate go-io (coreio) and go-log (coreerr) packages with
Core's built-in Fs and error/logging functions. This is the reference
implementation for how all Core ecosystem packages should migrate.
Changes:
- coreio.Local.Read/Write/EnsureDir/Delete/IsFile → core.Fs methods
- coreerr.E() → core.E(), coreerr.Info/Warn/Error → core.Info/Warn/Error
- (value, error) return pattern → core.Result pattern (r.OK, r.Value)
- go-io and go-log moved from direct to indirect deps in go.mod
- Added AX usage-example comments on key public types
- Added newFs("/") helper for unrestricted filesystem access
Co-Authored-By: Virgil <virgil@lethean.io>
