feat: resolve old inline comments when superseding review

Closes #27

After superseding an old review, resolves all its inline comments via
POST /pulls/comments/{id}/resolve. This clears unresolved conversation
markers from the PR timeline and diff view.

New API methods:
- ListReviewComments: paginated GET /repos/.../pulls/{n}/reviews/{id}/comments
- ResolveComment: POST /repos/.../pulls/comments/{id}/resolve

Behavior:
- Only resolves after successful supersede (gated on supersedeOK)
- Aggregates failures and logs at warn level
- Truncates error bodies to 256 bytes (security)
- Non-fatal: review still posts even if resolution fails

cmd/review-bot/main.go

@@ -369,10 +369,39 @@ func main() {
 	if existingReview != nil && existingCommentID > 0 {
 		newReviewURL := fmt.Sprintf("%s/%s/%s/pulls/%d#pullrequestreview-%d", strings.TrimRight(*giteaURL, "/"), owner, repoName, prNumber, posted.ID)
 		supersededBody := buildSupersededBody(existingReview.Body, existingReview.CommitID, newReviewURL, sentinel)
+		supersedeOK := false
 		if err := giteaClient.EditComment(ctx, owner, repoName, existingCommentID, supersededBody); err != nil {
 			slog.Warn("could not mark old review as superseded", "comment_id", existingCommentID, "error", err)
 		} else {
 			slog.Info("marked old review as superseded", "old_state", existingReview.State, "new_review_id", posted.ID, "pr", prNumber)
+			supersedeOK = true
+		}
+
+		// Resolve old review's inline comments only after successful supersede
+		if supersedeOK {
+			oldComments, err := giteaClient.ListReviewComments(ctx, owner, repoName, prNumber, existingReview.ID)
+			if err != nil {
+				slog.Warn("could not list old review comments for resolution", "review_id", existingReview.ID, "error", err)
+			} else {
+				resolved, failed := 0, 0
+				for _, c := range oldComments {
+					if c.ID == 0 {
+						continue
+					}
+					if err := giteaClient.ResolveComment(ctx, owner, repoName, c.ID); err != nil {
+						slog.Debug("could not resolve inline comment", "comment_id", c.ID, "error", err)
+						failed++
+					} else {
+						resolved++
+					}
+				}
+				if resolved > 0 {
+					slog.Info("resolved old inline comments", "count", resolved, "pr", prNumber)
+				}
+				if failed > 0 {
+					slog.Warn("some inline comments could not be resolved", "failed", failed, "pr", prNumber)
+				}
+			}
 		}
 	}
 

gitea/client.go

@@ -82,6 +82,7 @@ type ChangedFile struct {
 
 // ReviewComment represents an inline comment to attach to a review.
 type ReviewComment struct {
+	ID          int64  `json:"id,omitempty"`
 	Path        string `json:"path"`
 	NewPosition int64  `json:"new_position"`
 	Body        string `json:"body"`
@@ -513,3 +514,60 @@ func (c *Client) RequestReviewer(ctx context.Context, owner, repo string, number
 	}
 	return nil
 }
+
+// ListReviewComments returns the inline comments attached to a specific review.
+// Paginates through all pages.
+func (c *Client) ListReviewComments(ctx context.Context, owner, repo string, prNumber int, reviewID int64) ([]ReviewComment, error) {
+	const pageSize = 50
+	var all []ReviewComment
+	for page := 1; ; page++ {
+		reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews/%d/comments?limit=%d&page=%d",
+			c.baseURL,
+			url.PathEscape(owner),
+			url.PathEscape(repo),
+			prNumber,
+			reviewID,
+			pageSize,
+			page)
+		body, err := c.doGet(ctx, reqURL)
+		if err != nil {
+			return nil, fmt.Errorf("list review comments (page %d): %w", page, err)
+		}
+		var batch []ReviewComment
+		if err := json.Unmarshal(body, &batch); err != nil {
+			return nil, fmt.Errorf("parse review comments (page %d): %w", page, err)
+		}
+		all = append(all, batch...)
+		if len(batch) < pageSize {
+			break
+		}
+	}
+	return all, nil
+}
+
+// ResolveComment marks an inline review comment as resolved.
+func (c *Client) ResolveComment(ctx context.Context, owner, repo string, commentID int64) error {
+	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/comments/%d/resolve",
+		c.baseURL,
+		url.PathEscape(owner),
+		url.PathEscape(repo),
+		commentID)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, reqURL, nil)
+	if err != nil {
+		return fmt.Errorf("create resolve request: %w", err)
+	}
+	req.Header.Set("Authorization", "token "+c.token)
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return fmt.Errorf("resolve comment: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusNoContent {
+		body, _ := io.ReadAll(io.LimitReader(resp.Body, 256))
+		return fmt.Errorf("resolve comment failed (status %d): %s", resp.StatusCode, body)
+	}
+	return nil
+}

gitea/client_test.go

@@ -684,3 +684,62 @@ func TestRequestReviewer_Error(t *testing.T) {
 		t.Errorf("error should mention status code: %v", err)
 	}
 }
+
+func TestListReviewComments(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if !strings.Contains(r.URL.Path, "/pulls/1/reviews/42/comments") {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, `[{"id":100,"path":"main.go","new_position":5,"body":"finding"},{"id":101,"path":"lib.go","new_position":10,"body":"another"}]`)
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	comments, err := client.ListReviewComments(context.Background(), "owner", "repo", 1, 42)
+	if err != nil {
+		t.Fatalf("ListReviewComments() error = %v", err)
+	}
+	if len(comments) != 2 {
+		t.Fatalf("got %d comments, want 2", len(comments))
+	}
+	if comments[0].ID != 100 {
+		t.Errorf("comments[0].ID = %d, want 100", comments[0].ID)
+	}
+	if comments[1].Path != "lib.go" {
+		t.Errorf("comments[1].Path = %q, want %q", comments[1].Path, "lib.go")
+	}
+}
+
+func TestResolveComment(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			t.Errorf("expected POST, got %s", r.Method)
+		}
+		if !strings.Contains(r.URL.Path, "/pulls/comments/99/resolve") {
+			t.Errorf("unexpected path: %s", r.URL.Path)
+		}
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	err := client.ResolveComment(context.Background(), "owner", "repo", 99)
+	if err != nil {
+		t.Fatalf("ResolveComment() error = %v", err)
+	}
+}
+
+func TestResolveComment_Error(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Fprint(w, "not found")
+	}))
+	defer server.Close()
+
+	client := NewClient(server.URL, "test-token")
+	err := client.ResolveComment(context.Background(), "owner", "repo", 99)
+	if err == nil {
+		t.Fatal("expected error for 404 response")
+	}
+}