Add issue timeline listing

Co-Authored-By: Virgil <virgil@lethean.io>

docs/api-contract.md

@@ -113,6 +113,8 @@ Coverage notes: rows list direct tests when a symbol is named in test names or r
 | method | IssueService.DeleteReaction | `func (s *IssueService) DeleteReaction(ctx context.Context, owner, repo string, index int64, reaction string) error` | DeleteReaction removes a reaction from an issue. | No direct tests. |
 | method | IssueService.IterComments | `func (s *IssueService) IterComments(ctx context.Context, owner, repo string, index int64) iter.Seq2[types.Comment, error]` | IterComments returns an iterator over all comments on an issue. | No direct tests. |
 | method | IssueService.ListComments | `func (s *IssueService) ListComments(ctx context.Context, owner, repo string, index int64) ([]types.Comment, error)` | ListComments returns all comments on an issue. | No direct tests. |
+| method | IssueService.IterTimeline | `func (s *IssueService) IterTimeline(ctx context.Context, owner, repo string, index int64, since, before *time.Time) iter.Seq2[types.TimelineComment, error]` | IterTimeline returns an iterator over all comments and events on an issue. | `TestIssueService_IterTimeline_Good` |
+| method | IssueService.ListTimeline | `func (s *IssueService) ListTimeline(ctx context.Context, owner, repo string, index int64, since, before *time.Time) ([]types.TimelineComment, error)` | ListTimeline returns all comments and events on an issue. | `TestIssueService_ListTimeline_Good` |
 | method | IssueService.Pin | `func (s *IssueService) Pin(ctx context.Context, owner, repo string, index int64) error` | Pin pins an issue. | `TestIssueService_Good_Pin` |
 | method | IssueService.RemoveLabel | `func (s *IssueService) RemoveLabel(ctx context.Context, owner, repo string, index int64, labelID int64) error` | RemoveLabel removes a single label from an issue. | No direct tests. |
 | method | IssueService.SetDeadline | `func (s *IssueService) SetDeadline(ctx context.Context, owner, repo string, index int64, deadline string) error` | SetDeadline sets or updates the deadline on an issue. | No direct tests. |

issues.go

@@ -3,6 +3,7 @@ package forge
 import (
 	"context"
 	"iter"
+	"time"
 
 	"dappco.re/go/core/forge/types"
 )
@@ -118,6 +119,38 @@ func (s *IssueService) CreateComment(ctx context.Context, owner, repo string, in
 	return &out, nil
 }
 
+// ListTimeline returns all comments and events on an issue.
+func (s *IssueService) ListTimeline(ctx context.Context, owner, repo string, index int64, since, before *time.Time) ([]types.TimelineComment, error) {
+	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/timeline", pathParams("owner", owner, "repo", repo, "index", int64String(index)))
+	query := make(map[string]string, 2)
+	if since != nil {
+		query["since"] = since.Format(time.RFC3339)
+	}
+	if before != nil {
+		query["before"] = before.Format(time.RFC3339)
+	}
+	if len(query) == 0 {
+		query = nil
+	}
+	return ListAll[types.TimelineComment](ctx, s.client, path, query)
+}
+
+// IterTimeline returns an iterator over all comments and events on an issue.
+func (s *IssueService) IterTimeline(ctx context.Context, owner, repo string, index int64, since, before *time.Time) iter.Seq2[types.TimelineComment, error] {
+	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/timeline", pathParams("owner", owner, "repo", repo, "index", int64String(index)))
+	query := make(map[string]string, 2)
+	if since != nil {
+		query["since"] = since.Format(time.RFC3339)
+	}
+	if before != nil {
+		query["before"] = before.Format(time.RFC3339)
+	}
+	if len(query) == 0 {
+		query = nil
+	}
+	return ListIter[types.TimelineComment](ctx, s.client, path, query)
+}
+
 // ListSubscriptions returns all users subscribed to an issue.
 func (s *IssueService) ListSubscriptions(ctx context.Context, owner, repo string, index int64) ([]types.User, error) {
 	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/subscriptions", pathParams("owner", owner, "repo", repo, "index", int64String(index)))

issues_test.go

@@ -7,6 +7,7 @@ import (
 	"net/http/httptest"
 	"reflect"
 	"testing"
+	"time"
 
 	"dappco.re/go/core/forge/types"
 )
@@ -169,6 +170,74 @@ func TestIssueService_CreateComment_Good(t *testing.T) {
 	}
 }
 
+func TestIssueService_ListTimeline_Good(t *testing.T) {
+	since := time.Date(2026, time.March, 1, 12, 30, 0, 0, time.UTC)
+	before := time.Date(2026, time.March, 2, 12, 30, 0, 0, time.UTC)
+
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/core/go-forge/issues/1/timeline" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+		if got := r.URL.Query().Get("since"); got != since.Format(time.RFC3339) {
+			t.Errorf("got since=%q, want %q", got, since.Format(time.RFC3339))
+		}
+		if got := r.URL.Query().Get("before"); got != before.Format(time.RFC3339) {
+			t.Errorf("got before=%q, want %q", got, before.Format(time.RFC3339))
+		}
+		w.Header().Set("X-Total-Count", "2")
+		json.NewEncoder(w).Encode([]types.TimelineComment{
+			{ID: 11, Type: "comment", Body: "first"},
+			{ID: 12, Type: "state_change", Body: "second"},
+		})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	events, err := f.Issues.ListTimeline(context.Background(), "core", "go-forge", 1, &since, &before)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(events, []types.TimelineComment{
+		{ID: 11, Type: "comment", Body: "first"},
+		{ID: 12, Type: "state_change", Body: "second"},
+	}) {
+		t.Fatalf("got %#v", events)
+	}
+}
+
+func TestIssueService_IterTimeline_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/core/go-forge/issues/1/timeline" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+		w.Header().Set("X-Total-Count", "1")
+		json.NewEncoder(w).Encode([]types.TimelineComment{{ID: 11, Type: "comment", Body: "first"}})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	var seen []types.TimelineComment
+	for event, err := range f.Issues.IterTimeline(context.Background(), "core", "go-forge", 1, nil, nil) {
+		if err != nil {
+			t.Fatal(err)
+		}
+		seen = append(seen, event)
+	}
+	if !reflect.DeepEqual(seen, []types.TimelineComment{{ID: 11, Type: "comment", Body: "first"}}) {
+		t.Fatalf("got %#v", seen)
+	}
+}
+
 func TestIssueService_ListSubscriptions_Good(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodGet {