feat: add branch, notification, org, open, whoami commands

Ports five commands from tea that fgj-sid was missing:

- fgj branch {list,rename,delete} — list branches with protection
  status, rename, and delete with confirmation.
- fgj notification {list,read} — list user notifications (unread by
  default, --all for everything), mark individual threads read.
- fgj org {list,create,delete} — manage organizations on the host.
  Create accepts --description/--full-name/--website/--location and
  --visibility (public/limited/private).
- fgj open [number] — open the repo, issue, or PR in a browser.
  Auto-detects issue-vs-PR via GetIssue. Falls back to printing the
  URL when stdout is not a TTY or --url is passed.
- fgj whoami — display authenticated user + host.

All commands follow the established pattern (parseRepo + config.Load +
api.NewClientFromConfig + ios), support --json where list semantics
apply, and share a new loadClient helper for host-scoped (non-repo)
commands. Tested live against forgejo.zerova.net.

Refs audit recommendation.md §'v0.5.0 — Missing resources'.

cmd/open.go

@@ -0,0 +1,104 @@
+package cmd
+
+import (
+	"fmt"
+	"os/exec"
+	"runtime"
+
+	"forgejo.zerova.net/public/fgj-sid/internal/api"
+	"forgejo.zerova.net/public/fgj-sid/internal/config"
+	"github.com/spf13/cobra"
+)
+
+var openCmd = &cobra.Command{
+	Use:     "open [issue-or-pr-number]",
+	Aliases: []string{"o"},
+	Short:   "Open a repository, issue, or pull request in a browser",
+	Long: `Open the repository page in a web browser. When an issue or pull request
+number is given, that page is opened instead.
+
+Repository is auto-detected from the current git context, or specified with -R.`,
+	Example: `  # Open the current repository
+  fgj open
+
+  # Open a specific repository
+  fgj open -R owner/repo
+
+  # Open issue or PR #42 (Forgejo routes both via the same number)
+  fgj open 42
+  fgj open '#42'
+
+  # Print the URL instead of launching a browser
+  fgj open 42 --url`,
+	Args: cobra.MaximumNArgs(1),
+	RunE: runOpen,
+}
+
+func init() {
+	rootCmd.AddCommand(openCmd)
+	addRepoFlags(openCmd)
+	openCmd.Flags().Bool("url", false, "Print URL instead of opening a browser")
+}
+
+func runOpen(cmd *cobra.Command, args []string) error {
+	repo, _ := cmd.Flags().GetString("repo")
+	owner, name, err := parseRepo(repo)
+	if err != nil {
+		return err
+	}
+
+	cfg, err := config.Load()
+	if err != nil {
+		return err
+	}
+
+	client, err := api.NewClientFromConfig(cfg, "", getDetectedHost(), getCwd())
+	if err != nil {
+		return err
+	}
+
+	url := fmt.Sprintf("https://%s/%s/%s", client.Hostname(), owner, name)
+
+	if len(args) == 1 {
+		num, err := parseIssueArg(args[0])
+		if err != nil {
+			return fmt.Errorf("invalid issue or PR number %q: %w", args[0], err)
+		}
+		issue, _, err := client.GetIssue(owner, name, num)
+		if err != nil {
+			return fmt.Errorf("failed to look up #%d: %w", num, err)
+		}
+		kind := "issues"
+		if issue.PullRequest != nil {
+			kind = "pulls"
+		}
+		url = fmt.Sprintf("https://%s/%s/%s/%s/%d", client.Hostname(), owner, name, kind, num)
+	}
+
+	printOnly, _ := cmd.Flags().GetBool("url")
+	if printOnly || !ios.IsStdoutTTY() {
+		fmt.Fprintln(ios.Out, url)
+		return nil
+	}
+
+	if err := launchBrowser(url); err != nil {
+		fmt.Fprintf(ios.ErrOut, "Could not open browser (%v); URL: %s\n", err, url)
+		return nil
+	}
+	fmt.Fprintf(ios.ErrOut, "Opening %s in your browser.\n", url)
+	return nil
+}
+
+// launchBrowser opens url in the OS default browser.
+func launchBrowser(url string) error {
+	var cmd *exec.Cmd
+	switch runtime.GOOS {
+	case "darwin":
+		cmd = exec.Command("open", url)
+	case "windows":
+		cmd = exec.Command("cmd", "/c", "start", "", url)
+	default:
+		cmd = exec.Command("xdg-open", url)
+	}
+	return cmd.Start()
+}