feat/batch-changes: fix codingAgent prompt-quoting test

The previous assertion round-tripped the rendered shell script through
shellquote.Split and compared the last token to the expected prompt.
That tokenizer does not understand POSIX shell comments, so the
apostrophe in the install script's "can't" comment was read as an
unterminated single-quoted string and swallowed everything to EOF as
one token. Production /bin/sh handles the comment correctly; only the
test was broken.

Assert on the shell-quoted suffix instead.

Author: taras-yemets

lib/batches/codingagent/codingagent_test.go

@@ -2,6 +2,7 @@ package codingagent_test
 
 import (
 	"errors"
+	"strings"
 	"testing"
 
 	"github.com/kballard/go-shellquote"
@@ -36,13 +37,20 @@ func TestRenderRunCommand_promptShellQuoting(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	tokens, err := shellquote.Split(cmd)
-	if err != nil {
-		t.Fatal(err)
-	}
+	// The rendered command appends the shell-quoted prompt as its final
+	// argument. Round-tripping via shellquote.Split is unreliable here
+	// because the install script contains POSIX shell comments with
+	// apostrophes (e.g. "can't"), which shellquote does not understand
+	// and would treat as unterminated quoted strings. Assert on the
+	// suffix instead.
 	wantPrompt := "You're working in the " + repoName + " repository.\n" +
 		"Add a README section describing the project; don't touch existing files."
-	if got := tokens[len(tokens)-1]; got != wantPrompt {
-		t.Fatalf("prompt mismatch:\n  got:  %q\n  want: %q", got, wantPrompt)
+	wantQuoted := shellquote.Join(wantPrompt)
+	if !strings.HasSuffix(cmd, wantQuoted) {
+		tail := cmd
+		if n := len(wantQuoted) + 50; len(cmd) > n {
+			tail = cmd[len(cmd)-n:]
+		}
+		t.Fatalf("rendered cmd does not end with shell-quoted prompt:\n  want suffix: %q\n  cmd tail:    %q", wantQuoted, tail)
 	}
 }