fix: make worker handoff rotation durable

internal/continuity/continuity_test.go

@@ -12,6 +12,54 @@ import (
 	"orchestra/internal/store"
 )
 
+func TestScratchCommitCapturesAllGitStatesExceptProtocolMarkers(t *testing.T) {
+	repo := t.TempDir()
+	run := func(args ...string) {
+		t.Helper()
+		if out, err := exec.Command("git", append([]string{"-C", repo}, args...)...).CombinedOutput(); err != nil {
+			t.Fatalf("git %v: %v: %s", args, err, out)
+		}
+	}
+	run("init")
+	run("config", "user.email", "t@t")
+	run("config", "user.name", "t")
+	for _, name := range []string{"TASK.md", "deleted.txt", "renamed.txt", "staged.txt"} {
+		if err := os.WriteFile(filepath.Join(repo, name), []byte(name), 0644); err != nil {
+			t.Fatal(err)
+		}
+	}
+	run("add", "-A")
+	run("commit", "-m", "base")
+	if err := os.WriteFile(filepath.Join(repo, "staged.txt"), []byte("staged change"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	run("add", "staged.txt")
+	if err := os.Remove(filepath.Join(repo, "deleted.txt")); err != nil {
+		t.Fatal(err)
+	}
+	run("mv", "renamed.txt", "renamed-new.txt")
+	if err := os.WriteFile(filepath.Join(repo, "untracked.txt"), []byte("new"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(repo, ".orchestra-handoff-report.md"), []byte("protocol"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	if err := ScratchCommit(repo, "orchestra/scratch/test", "checkpoint"); err != nil {
+		t.Fatal(err)
+	}
+	for _, want := range []string{"staged.txt", "renamed-new.txt", "untracked.txt"} {
+		if err := exec.Command("git", "-C", repo, "cat-file", "-e", "HEAD:"+want).Run(); err != nil {
+			t.Fatalf("checkpoint omitted %s: %v", want, err)
+		}
+	}
+	if err := exec.Command("git", "-C", repo, "cat-file", "-e", "HEAD:deleted.txt").Run(); err == nil {
+		t.Fatal("checkpoint retained deleted file")
+	}
+	if err := exec.Command("git", "-C", repo, "cat-file", "-e", "HEAD:.orchestra-handoff-report.md").Run(); err == nil {
+		t.Fatal("checkpoint committed protocol marker")
+	}
+}
+
 func TestHandoffCASAndPickup(t *testing.T) {
 	root := t.TempDir()
 	run := func(a ...string) {