fix(web): paginate all PR comments when searching for existing summary

Replaces the single-page octokit.rest.issues.listComments call with
octokit.paginate(...) so all comment pages are searched before deciding
whether to create or update the summary comment. Without this, the marker
could be missed on PRs with many comments, causing duplicate summary
comments on re-runs.

Tests updated to mock octokit.paginate directly instead of
rest.issues.listComments, and assertions updated accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: fatmcgav

packages/web/src/features/agents/review-agent/nodes/githubPushPrReviews.test.ts

@@ -31,20 +31,22 @@ const SINGLE_REVIEW: sourcebot_file_diff_review[] = [
 ];
 
 function makeMockOctokit(createReviewCommentResult: 'resolve' | 'reject' = 'resolve', existingComments: { id: number; body: string }[] = []) {
-    return {
+    const octokit = {
+        paginate: vi.fn().mockResolvedValue(existingComments),
         rest: {
             pulls: {
                 createReviewComment: createReviewCommentResult === 'resolve'
                     ? vi.fn().mockResolvedValue({})
                     : vi.fn().mockRejectedValue(new Error('Unprocessable Entity')),
             },
             issues: {
-                listComments: vi.fn().mockResolvedValue({ data: existingComments }),
+                listComments: vi.fn(),
                 createComment: vi.fn().mockResolvedValue({}),
                 updateComment: vi.fn().mockResolvedValue({}),
             },
         },
-    } as unknown as Octokit;
+    } as any;
+    return octokit;
 }
 
 describe('githubPushPrReviews', () => {
@@ -161,7 +163,7 @@ describe('githubPushPrReviews – summary comment', () => {
 
         await githubPushPrReviews(octokit, MOCK_PAYLOAD, [], undefined);
 
-        expect(octokit.rest.issues.listComments).not.toHaveBeenCalled();
+        expect(octokit.paginate).not.toHaveBeenCalled();
         expect(octokit.rest.issues.createComment).not.toHaveBeenCalled();
         expect(octokit.rest.issues.updateComment).not.toHaveBeenCalled();
     });
@@ -171,11 +173,10 @@ describe('githubPushPrReviews – summary comment', () => {
 
         await githubPushPrReviews(octokit, MOCK_PAYLOAD, [], 'Summary text');
 
-        expect(octokit.rest.issues.listComments).toHaveBeenCalledWith({
-            owner: 'my-org',
-            repo: 'my-repo',
-            issue_number: 7,
-        });
+        expect(octokit.paginate).toHaveBeenCalledWith(
+            octokit.rest.issues.listComments,
+            { owner: 'my-org', repo: 'my-repo', issue_number: 7 },
+        );
         expect(octokit.rest.issues.createComment).toHaveBeenCalledOnce();
         const body = octokit.rest.issues.createComment.mock.calls[0][0].body as string;
         expect(body).toContain(SUMMARY_MARKER);
@@ -202,9 +203,9 @@ describe('githubPushPrReviews – summary comment', () => {
         expect(octokit.rest.issues.createComment).not.toHaveBeenCalled();
     });
 
-    test('does not throw when listComments fails', async () => {
+    test('does not throw when paginate fails', async () => {
         const octokit = makeMockOctokit();
-        octokit.rest.issues.listComments = vi.fn().mockRejectedValue(new Error('403 Forbidden'));
+        octokit.paginate = vi.fn().mockRejectedValue(new Error('403 Forbidden'));
 
         await expect(
             githubPushPrReviews(octokit, MOCK_PAYLOAD, [], 'Summary text'),

packages/web/src/features/agents/review-agent/nodes/githubPushPrReviews.ts

@@ -10,7 +10,7 @@ export const githubPushPrReviews = async (octokit: Octokit, pr_payload: sourcebo
     if (summary) {
         const SUMMARY_MARKER = "<!-- sourcebot-review-summary -->";
         try {
-            const { data: comments } = await octokit.rest.issues.listComments({
+            const comments = await octokit.paginate(octokit.rest.issues.listComments, {
                 owner: pr_payload.owner,
                 repo: pr_payload.repo,
                 issue_number: pr_payload.number,