Implement restore execution for the restore subcommand

internal/app/restore.go

@@ -8,12 +8,14 @@ import (
 	"io"
 
 	"gitea.maximumdirect.net/eric/narratio/internal/adapters/storage"
+	"gitea.maximumdirect.net/eric/narratio/internal/artifacts"
 	"gitea.maximumdirect.net/eric/narratio/internal/config"
 )
 
 var newObjectStoreFromConfigFn = storage.NewObjectStoreFromConfig
 var discoverRemoteCurrentStateFn = discoverRemoteCurrentState
 var buildRestorePlanFn = buildRestorePlan
+var executeRestorePlanFn = executeRestorePlan
 
 // Restore validates restore CLI/config inputs and storage preflight for future restore phases.
 func Restore(ctx context.Context, args []string, out io.Writer) error {
@@ -93,16 +95,43 @@ func Restore(ctx context.Context, args []string, out io.Writer) error {
 	if dryRun {
 		return nil
 	}
+
+	artifactStore := artifacts.NewLocalStore(cfg.Pipeline.Workspace.Root)
+	if _, err := artifactStore.EnsureLayoutFor(cfg.Session.Campaign, cfg.Session.SessionID); err != nil {
+		return fmt.Errorf("restore: prepare workdir: %w", err)
+	}
+	lock, err := artifactStore.AcquireSessionLockFor(cfg.Session.Campaign, cfg.Session.SessionID)
+	if err != nil {
+		return fmt.Errorf("restore: acquire session lock: %w", err)
+	}
+	defer func() {
+		_ = artifactStore.ReleaseSessionLock(lock)
+	}()
+
 	if plan.ConflictCount > 0 && !force {
 		return fmt.Errorf(
 			"restore: plan has %d conflicting path(s); rerun with --force or resolve local conflicts",
 			plan.ConflictCount,
 		)
 	}
-	return fmt.Errorf(
-		"restore: planned remote restore for %s/%s (run %s); not yet implemented (phase 4: restore execution)",
+
+	result, err := executeRestorePlanFn(ctx, cfg, current, plan, objectStore)
+	if err != nil {
+		return fmt.Errorf("restore: execute plan: %w", err)
+	}
+
+	_, err = fmt.Fprintf(
+		out,
+		"restore complete: session %s/%s run=%s downloaded=%d skipped_same=%d conflicts=%d\n",
 		current.Campaign,
 		current.SessionID,
 		current.RunID,
+		result.DownloadedCount,
+		plan.SkipSameCount,
+		plan.ConflictCount,
 	)
+	if err != nil {
+		return fmt.Errorf("restore: write summary: %w", err)
+	}
+	return nil
 }