feat: all six CLI commands (new, list, resume, open, info, archive)

Complete command implementations with all flags per spec. Shared query resolution helper.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cmd/helpers.go

@@ -0,0 +1,33 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/warrenronsiek/ctask/internal/workspace"
+)
+
+// resolveOne resolves a query to exactly one workspace. Prints errors and exits on 0 or >1 matches.
+func resolveOne(root, query string, includeArchived bool) *workspace.QueryResult {
+	results, err := workspace.ResolveQuery(root, query, includeArchived)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+
+	if len(results) == 0 {
+		fmt.Fprintf(os.Stderr, "No workspace matches %q.\n", query)
+		os.Exit(1)
+	}
+
+	if len(results) > 1 {
+		fmt.Fprintf(os.Stderr, "Multiple workspaces match %q:\n", query)
+		for _, r := range results {
+			fmt.Fprintf(os.Stderr, "  %s\n", workspace.RelativePath(root, r.Path))
+		}
+		fmt.Fprintln(os.Stderr, "Specify a more precise query.")
+		os.Exit(1)
+	}
+
+	return &results[0]
+}