Improve post-create script output formatting

Indent script output with │ prefix, wrap in ╭─/╰─ brackets, and
clear leftover agent UI before printing session-ended message.

Author: blipinsk

cmd/root.go

@@ -320,13 +320,17 @@ func runPostCreateScript(cfg *mob.Config, worktreePath string) error {
 	if cfg.PostCreateScript == "" {
 		return nil
 	}
-	p := mobProgress("Running post-create script...")
+	dim := "\033[2m"
+	reset := "\033[0m"
+	mobStatus("Running post-create script...")
+	fmt.Printf("  %s╭─%s\n", dim, reset)
 	err := mob.RunPostCreateScript(cfg, worktreePath)
+	fmt.Printf("  %s╰─%s\n", dim, reset)
 	if err != nil {
-		p.Done("Post-create script failed")
+		mobStatus("Post-create script failed")
 		return err
 	}
-	p.Done("Post-create script completed")
+	mobStatus("Post-create script completed")
 	return nil
 }
 
@@ -903,6 +907,7 @@ func launchAgent(root, agent, workdir string, resume bool) error {
 			}
 		}
 
+		fmt.Print("\033[2K")
 		mobStatus(fmt.Sprintf("Session ended - mob '%s'", filepath.Base(workdir)))
 
 		// Always check for queued action, regardless of how the agent exited

internal/mob/mob.go

@@ -1,6 +1,7 @@
 package mob
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"os"
@@ -302,14 +303,43 @@ func RunPostCreateScript(cfg *Config, worktreePath string) error {
 
 	cmd := exec.Command(scriptPath)
 	cmd.Dir = worktreePath
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
+	cmd.Stdout = newPrefixWriter(os.Stdout, "  │ ")
+	cmd.Stderr = newPrefixWriter(os.Stderr, "  │ ")
 	if err := cmd.Run(); err != nil {
 		return fmt.Errorf("post_create_script failed: %w", err)
 	}
 	return nil
 }
 
+type prefixWriter struct {
+	out     *os.File
+	prefix  string
+	atStart bool
+}
+
+func newPrefixWriter(out *os.File, prefix string) *prefixWriter {
+	return &prefixWriter{out: out, prefix: prefix, atStart: true}
+}
+
+func (w *prefixWriter) Write(p []byte) (int, error) {
+	total := len(p)
+	for len(p) > 0 {
+		if w.atStart {
+			w.out.WriteString(w.prefix)
+			w.atStart = false
+		}
+		nl := bytes.IndexByte(p, '\n')
+		if nl == -1 {
+			w.out.Write(p)
+			break
+		}
+		w.out.Write(p[:nl+1])
+		w.atStart = true
+		p = p[nl+1:]
+	}
+	return total, nil
+}
+
 // FindMob finds a mob by name.
 func FindMob(cfg *Config, name string) *Mob {
 	for i := range cfg.Mobs {