@@ -40,0 +103,4 @@
+			for j, h := range hunks {
+				hseg := h
+				if j != 0 {
+					hseg = "@@ " + h

@@ -0,0 +30,4 @@
+	if !strings.HasPrefix(chunks[0], "diff --git a/file1.txt") {
+		t.Fatalf("first chunk does not contain file1 header: %s", chunks[0])
+	}
+	if !strings.HasPrefix(chunks[1], "diff --git a/file2.txt") {

@@ -7,7 +7,9 @@ require (
 	github.com/alecthomas/kong v1.14.0
 	github.com/alecthomas/kong-yaml v0.2.0
 	github.com/google/generative-ai-go v0.20.1

@@ -13,0 +11,4 @@
+	maxChunkSize int
+	guidelines   []string
+	git          GitAdapter
+	chat         ChatAdapter

@@ -40,0 +80,4 @@
+// It tries to split on file boundaries ("diff --git") first, then on hunk boundaries (@@),
+// and finally on a hard byte limit.
+func splitDiffIntoChunks(diff []byte, maxSize int) []string {
+	if len(diff) <= maxSize {

@@ -40,0 +121,4 @@
+			}
+		} else {
+			current.WriteString(seg)
+		}

@@ -23,0 +26,4 @@
+	headSHA, err := s.git.GetPRHeadSHA(ctx, organisation, repo, prID)
+	if err != nil {
+		log.Printf("warning: could not fetch PR head SHA (%v); skipping sanity check", err)
+	} else {

@@ -23,0 +30,4 @@
+		filtered := []Comment{}
+		for _, c := range comments {
+			// Retrieve full file content at the PR head
+			fileContent, fErr := s.git.GetFileContent(ctx, organisation, repo, c.File, headSHA)