Clean up obsolete placeholder code

internal/artifacts/s3.go

@@ -1,57 +0,0 @@
-package artifacts
-
-import (
-	"fmt"
-	"os"
-)
-
-// S3Store is a placeholder for future remote artifact persistence support.
-type S3Store struct {
-	Bucket string
-	Prefix string
-}
-
-// SessionPathsFor is not implemented for S3-backed storage.
-func (s *S3Store) SessionPathsFor(_, _ string) SessionPaths {
-	return SessionPaths{}
-}
-
-// EnsureLayoutFor returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) EnsureLayoutFor(_, _ string) (SessionPaths, error) {
-	return SessionPaths{}, fmt.Errorf("artifacts s3 ensure layout for campaign/session: not yet implemented")
-}
-
-// CopyInputFor returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) CopyInputFor(_, _, _, _ string) (Ref, error) {
-	return Ref{}, fmt.Errorf("artifacts s3 copy input for campaign/session: not yet implemented")
-}
-
-// Exists returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) Exists(_ string) (bool, error) {
-	return false, fmt.Errorf("artifacts s3 exists: not yet implemented")
-}
-
-// ExistsRef returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) ExistsRef(_ Ref) (bool, error) {
-	return false, fmt.Errorf("artifacts s3 exists ref: not yet implemented")
-}
-
-// WriteFileAtomic returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) WriteFileAtomic(_ string, _ []byte, _ os.FileMode) error {
-	return fmt.Errorf("artifacts s3 write file atomic: not yet implemented")
-}
-
-// Checksum returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) Checksum(_ string) (string, error) {
-	return "", fmt.Errorf("artifacts s3 checksum: not yet implemented")
-}
-
-// AcquireSessionLockFor returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) AcquireSessionLockFor(_, _ string) (*LockHandle, error) {
-	return nil, fmt.Errorf("artifacts s3 acquire lock for campaign/session: not yet implemented")
-}
-
-// ReleaseSessionLock returns a not-yet-implemented error in the scaffold.
-func (s *S3Store) ReleaseSessionLock(_ *LockHandle) error {
-	return fmt.Errorf("artifacts s3 release lock: not yet implemented")
-}