fix(v0.5.1): use local time for workspace directory prefix and info display

Workspace directory names (YYYY-MM-DD_slug) and the YYYYMMDD-HHMMSS ID
field now use local time so users see their wall-clock date rather
than UTC — the prior behavior caused evening-EST creations to appear
under tomorrow's date for several hours every day. ctask info's
Created/Updated/Archived lines also convert to local for display.

Stored timestamps in task.yaml, session logs, the lease, the manifest,
and the session summary all continue to use UTC. Only user-facing
surfaces change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/workspace/create.go

@@ -62,9 +62,13 @@ func Create(opts CreateOpts) (*CreateResult, error) {
 		slug = "task"
 	}
 
-	now := time.Now().UTC()
-	date := now.Format("2006-01-02")
-	id := now.Format("20060102-150405")
+	// v0.5.1: directory prefix and ID use local time so users see their
+	// wall-clock date rather than UTC. Stored task.yaml timestamps still
+	// use UTC (see meta below) for unambiguous machine-readable format.
+	nowLocal := time.Now()
+	date := nowLocal.Format("2006-01-02")
+	id := nowLocal.Format("20060102-150405")
+	now := nowLocal.UTC()
 
 	categoryDir := opts.Root
 	if !opts.SkipCategoryDir {

internal/workspace/create_test.go

@@ -5,6 +5,7 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestCreateWorkspace(t *testing.T) {
@@ -372,6 +373,43 @@ func TestCreateProjectSubdirMatchesSuffixedSlug(t *testing.T) {
 	}
 }
 
+func TestCreateDirectoryPrefixUsesLocalDate(t *testing.T) {
+	// v0.5.1: directory prefix must use local-time date so users see
+	// their wall-clock date rather than UTC date on evening EST runs.
+	root := t.TempDir()
+	expected := time.Now().Format("2006-01-02") // LOCAL — no .UTC()
+	res, err := Create(CreateOpts{
+		Root: root, Title: "tz-check", Category: "general",
+		Mode: "local", Agent: "claude",
+	})
+	if err != nil {
+		t.Fatalf("Create: %v", err)
+	}
+	dirBase := filepath.Base(res.Path)
+	if !strings.HasPrefix(dirBase, expected) {
+		t.Errorf("directory %q should start with local-date prefix %q", dirBase, expected)
+	}
+}
+
+func TestCreateStoresTimestampsInUTC(t *testing.T) {
+	// v0.5.1: even though the directory prefix is local, stored task.yaml
+	// timestamps must remain UTC (unambiguous machine-readable format).
+	root := t.TempDir()
+	res, err := Create(CreateOpts{
+		Root: root, Title: "tz-check-stored", Category: "general",
+		Mode: "local", Agent: "claude",
+	})
+	if err != nil {
+		t.Fatalf("Create: %v", err)
+	}
+	if got := res.Meta.CreatedAt.Location(); got != time.UTC {
+		t.Errorf("CreatedAt location: got %v, want UTC", got)
+	}
+	if got := res.Meta.UpdatedAt.Location(); got != time.UTC {
+		t.Errorf("UpdatedAt location: got %v, want UTC", got)
+	}
+}
+
 func TestCreateTaskDoesNotScaffoldSubdir(t *testing.T) {
 	root := t.TempDir()
 	res, err := Create(CreateOpts{