Add teabot daemon implementation

teabot watches Gitea repos and dispatches one-shot Claude Code sessions in
Docker containers to work issues and review PRs, acting as configurable bot
personalities.

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

internal/cli/root.go

@@ -0,0 +1,45 @@
+// Package cli wires teabot's cobra command tree.
+package cli
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"git.unkin.net/unkin/teabot/internal/config"
+)
+
+var (
+	// configPath is the --config flag shared by the commands that need it.
+	configPath string
+	buildVer   string
+)
+
+func newRootCmd() *cobra.Command {
+	root := &cobra.Command{
+		Use:   "teabot",
+		Short: "Watch Gitea repos and dispatch one-shot Claude Code sessions",
+		Long: "teabot polls Gitea repositories for new issues, pull requests, and comments,\n" +
+			"then dispatches one-shot Claude Code sessions in Docker containers to implement\n" +
+			"issues and review pull requests using configurable bot personalities.",
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		Version:       buildVer,
+	}
+	root.PersistentFlags().StringVarP(&configPath, "config", "c", config.DefaultConfigPath(),
+		"path to teabot config file")
+
+	root.AddCommand(newRunCmd())
+	root.AddCommand(newConfigCmd())
+	return root
+}
+
+// Execute runs the CLI with the given build version.
+func Execute(version string) {
+	buildVer = version
+	if err := newRootCmd().Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, "teabot:", err)
+		os.Exit(1)
+	}
+}