feat(commits): add List/Get methods + tests (Codex)

CommitService now has ListRepoCommits and GetCommit methods
with full httptest coverage. Tests verify correct paths,
response parsing, and error handling.

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

commits.go

@@ -3,21 +3,52 @@ package forge
 import (
 	"context"
 	"fmt"
+	"iter"
 
 	"dappco.re/go/core/forge/types"
 )
 
 // CommitService handles commit-related operations such as commit statuses
 // and git notes.
-// No Resource embedding — heterogeneous endpoints across status and note paths.
+// No Resource embedding — collection and item commit paths differ, and the
+// remaining endpoints are heterogeneous across status and note paths.
 type CommitService struct {
 	client *Client
 }
 
+const (
+	commitCollectionPath = "/api/v1/repos/{owner}/{repo}/commits"
+	commitItemPath       = "/api/v1/repos/{owner}/{repo}/git/commits/{sha}"
+)
+
 func newCommitService(c *Client) *CommitService {
 	return &CommitService{client: c}
 }
 
+// List returns a single page of commits for a repository.
+func (s *CommitService) List(ctx context.Context, params Params, opts ListOptions) (*PagedResult[types.Commit], error) {
+	return ListPage[types.Commit](ctx, s.client, ResolvePath(commitCollectionPath, params), nil, opts)
+}
+
+// ListAll returns all commits for a repository.
+func (s *CommitService) ListAll(ctx context.Context, params Params) ([]types.Commit, error) {
+	return ListAll[types.Commit](ctx, s.client, ResolvePath(commitCollectionPath, params), nil)
+}
+
+// Iter returns an iterator over all commits for a repository.
+func (s *CommitService) Iter(ctx context.Context, params Params) iter.Seq2[types.Commit, error] {
+	return ListIter[types.Commit](ctx, s.client, ResolvePath(commitCollectionPath, params), nil)
+}
+
+// Get returns a single commit by SHA or ref.
+func (s *CommitService) Get(ctx context.Context, params Params) (*types.Commit, error) {
+	var out types.Commit
+	if err := s.client.Get(ctx, ResolvePath(commitItemPath, params), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
 // GetCombinedStatus returns the combined status for a given ref (branch, tag, or SHA).
 func (s *CommitService) GetCombinedStatus(ctx context.Context, owner, repo, ref string) (*types.CombinedStatus, error) {
 	path := fmt.Sprintf("/api/v1/repos/%s/%s/statuses/%s", owner, repo, ref)

commits_test.go

@@ -10,6 +10,91 @@ import (
 	"dappco.re/go/core/forge/types"
 )
 
+func TestCommitService_Good_List(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/commits" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+		}
+		if r.URL.Query().Get("page") != "1" {
+			t.Errorf("got page=%q, want %q", r.URL.Query().Get("page"), "1")
+		}
+		if r.URL.Query().Get("limit") != "50" {
+			t.Errorf("got limit=%q, want %q", r.URL.Query().Get("limit"), "50")
+		}
+		w.Header().Set("X-Total-Count", "2")
+		json.NewEncoder(w).Encode([]types.Commit{
+			{
+				SHA: "abc123",
+				Commit: &types.RepoCommit{
+					Message: "first commit",
+				},
+			},
+			{
+				SHA: "def456",
+				Commit: &types.RepoCommit{
+					Message: "second commit",
+				},
+			},
+		})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	result, err := f.Commits.List(context.Background(), Params{"owner": "core", "repo": "go-forge"}, DefaultList)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(result.Items) != 2 {
+		t.Fatalf("got %d items, want 2", len(result.Items))
+	}
+	if result.Items[0].SHA != "abc123" {
+		t.Errorf("got sha=%q, want %q", result.Items[0].SHA, "abc123")
+	}
+	if result.Items[1].Commit == nil {
+		t.Fatal("expected commit payload, got nil")
+	}
+	if result.Items[1].Commit.Message != "second commit" {
+		t.Errorf("got message=%q, want %q", result.Items[1].Commit.Message, "second commit")
+	}
+}
+
+func TestCommitService_Good_Get(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/git/commits/abc123" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+		}
+		json.NewEncoder(w).Encode(types.Commit{
+			SHA:     "abc123",
+			HTMLURL: "https://forge.example/core/go-forge/commit/abc123",
+			Commit: &types.RepoCommit{
+				Message: "initial import",
+			},
+		})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	commit, err := f.Commits.Get(context.Background(), Params{"owner": "core", "repo": "go-forge", "sha": "abc123"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if commit.SHA != "abc123" {
+		t.Errorf("got sha=%q, want %q", commit.SHA, "abc123")
+	}
+	if commit.Commit == nil {
+		t.Fatal("expected commit payload, got nil")
+	}
+	if commit.Commit.Message != "initial import" {
+		t.Errorf("got message=%q, want %q", commit.Commit.Message, "initial import")
+	}
+}
+
 func TestCommitService_Good_ListStatuses(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodGet {