[dev-loop] Add tests for GetTimelineReviewCommentIDForReview and GitHub GetAllFilesInPath

gitea: Add 4 tests for GetTimelineReviewCommentIDForReview (was 0% coverage):
- Success: find review in timeline by user login + body prefix match
- ReviewFetchError: 404 on review API
- EmptyBody: review with empty body returns error
- NotFoundInTimeline: body matches but user login doesn't

github: Add 3 tests for GetAllFilesInPath (was 0% coverage):
- DirectoryWithFiles: lists directory, fetches base64-encoded file content
- 404FallsBackToFile: 404 on dir path returns error when file also 404s
- DirectoryWithSubdir: recursive directory traversal

Coverage changes:
- gitea: 80.0% → 85.2%
- github: 79.9% → 86.3%

gitea/client_test.go

@@ -1420,3 +1420,80 @@ func TestNewSafeHTTPClient_PreservesDefaultTransportSettings(t *testing.T) {
 		t.Error("DialContext is nil; expected safeDialContext")
 	}
 }
+
+func TestGetTimelineReviewCommentIDForReview(t *testing.T) {
+	const reviewID = int64(42)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/api/v1/repos/owner/repo/pulls/5/reviews/42":
+			w.Write([]byte(`{"body": "The review body <!-- review-bot:sonnet -->", "user": {"login": "sonnet-review"}}`))
+		case "/api/v1/repos/owner/repo/issues/5/timeline":
+			w.Write([]byte(`[
+				{"id": 100, "type": "comment", "body": "unrelated", "user": {"login": "sonnet-review"}},
+				{"id": 200, "type": "review", "body": "The review body <!-- review-bot:sonnet -->", "user": {"login": "sonnet-review"}}
+			]`))
+		default:
+			t.Errorf("unexpected path: %s", r.URL.Path)
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	defer server.Close()
+
+	client := NewTestClient(server.URL, "test-token")
+	id, err := client.GetTimelineReviewCommentIDForReview(context.Background(), "owner", "repo", 5, reviewID)
+	if err != nil {
+		t.Fatalf("GetTimelineReviewCommentIDForReview() error = %v", err)
+	}
+	if id != 200 {
+		t.Errorf("got id=%d, want 200", id)
+	}
+}
+
+func TestGetTimelineReviewCommentIDForReview_ReviewFetchError(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+		w.Write([]byte(`{"message":"not found"}`))
+	}))
+	defer server.Close()
+
+	client := NewTestClient(server.URL, "test-token")
+	_, err := client.GetTimelineReviewCommentIDForReview(context.Background(), "owner", "repo", 5, 99)
+	if err == nil {
+		t.Fatal("expected error for missing review, got nil")
+	}
+}
+
+func TestGetTimelineReviewCommentIDForReview_EmptyBody(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(`{"body": "", "user": {"login": "bot"}}`))
+	}))
+	defer server.Close()
+
+	client := NewTestClient(server.URL, "test-token")
+	_, err := client.GetTimelineReviewCommentIDForReview(context.Background(), "owner", "repo", 5, 42)
+	if err == nil {
+		t.Fatal("expected error for empty body, got nil")
+	}
+	if !strings.Contains(err.Error(), "empty body") {
+		t.Errorf("error = %q, want to contain 'empty body'", err.Error())
+	}
+}
+
+func TestGetTimelineReviewCommentIDForReview_NotFoundInTimeline(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/api/v1/repos/owner/repo/pulls/5/reviews/42":
+			w.Write([]byte(`{"body": "review content <!-- review-bot:sonnet -->", "user": {"login": "bot"}}`))
+		default:
+			// Timeline returns events that don't match (different user)
+			w.Write([]byte(`[{"id": 1, "type": "review", "body": "review content <!-- review-bot:sonnet -->", "user": {"login": "other-user"}}]`))
+		}
+	}))
+	defer server.Close()
+
+	client := NewTestClient(server.URL, "test-token")
+	_, err := client.GetTimelineReviewCommentIDForReview(context.Background(), "owner", "repo", 5, 42)
+	if err == nil {
+		t.Fatal("expected error when review not found in timeline, got nil")
+	}
+}