fix(repo): reject --repo on commands that act on no repository

tea repo list -R acme/service listed the account's repositories and
tea repo create foo -R alice/project created alice/foo: the flag was
silently ignored. repo list, repo create, repo migrate and search repo
now fail with a usage error that suggests the intended command, such as
"--repo is not used by repo list; did you mean: tea repo list acme".

repo list takes the owner as an argument (--owner still works), and
repo create accepts OWNER/NAME, creating in the organization OWNER.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/repository_create.go

@@ -4,6 +4,7 @@
 package app
 
 import (
+	"cmp"
 	"errors"
 	"fmt"
 	"strings"
@@ -32,6 +33,15 @@ func (a *application) repoCreateCommand() *cobra.Command {
 			}
 			opts.Name = args[0]
 		}
+		if err := a.rejectRepoFlag(cmd, func(owner string) string { return "tea repo create " + owner + "/" + cmp.Or(opts.Name, "NAME") }); err != nil {
+			return err
+		}
+		if owner, name, ok := strings.Cut(opts.Name, "/"); ok {
+			if cmd.Flags().Changed("org") {
+				return clierr.Wrap(clierr.Usage, errors.New("supply the owner as OWNER/NAME or --org, not both"))
+			}
+			org, opts.Name = owner, name
+		}
 		if cmd.Flags().Changed("team") && (org == "" || strings.TrimSpace(team) == "") {
 			return clierr.Wrap(clierr.Usage, errors.New("--team requires --org and a team name"))
 		}
@@ -66,9 +76,6 @@ func (a *application) repoCreateCommand() *cobra.Command {
 		}
 		selected := *a
 		if source != "" {
-			if a.options.repo != "" {
-				return clierr.Wrap(clierr.Usage, errors.New("--template and --repo cannot both select a source repository"))
-			}
 			for _, flag := range []string{"auto-init", "label-template", "gitignores", "license", "readme", "as-template", "trust-model", "object-format"} {
 				if cmd.Flags().Changed(flag) {
 					return clierr.Wrap(clierr.Usage, errors.New("repository initialization options cannot be combined with --template"))
@@ -86,6 +93,12 @@ func (a *application) repoCreateCommand() *cobra.Command {
 		if err != nil {
 			return err
 		}
+		if !cmd.Flags().Changed("org") && strings.EqualFold(org, target.User) {
+			if team != "" {
+				return clierr.Wrap(clierr.Usage, errors.New("--team requires a repository owned by an organization"))
+			}
+			org = ""
+		}
 		if prompted {
 			if err := a.confirm(cmd, "Create repository "+opts.Name+" on "+target.Host); err != nil {
 				return err