docs: add Go doc comments to exported symbols for docstring coverage

Add missing doc comments to Store.Create, Store.GetByName, Store.ListByExecution,
FilesystemTmpStorage.Put, FilesystemTmpStorage.DeleteByPrefix, and
DockerRunConnector.Execute to reach 80% docstring coverage on PR-modified files.

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

Author: michaelmcnees

internal/artifact/store.go

@@ -23,6 +23,7 @@ type Store struct {
 	DB *sql.DB
 }
 
+// Create inserts artifact metadata into the database.
 func (s *Store) Create(ctx context.Context, a *Artifact) error {
 	_, err := s.DB.ExecContext(ctx, `
 		INSERT INTO execution_artifacts (execution_id, step_name, name, url, size)
@@ -34,6 +35,7 @@ func (s *Store) Create(ctx context.Context, a *Artifact) error {
 	return nil
 }
 
+// GetByName retrieves a single artifact by execution ID and artifact name.
 func (s *Store) GetByName(ctx context.Context, executionID, name string) (*Artifact, error) {
 	var a Artifact
 	err := s.DB.QueryRowContext(ctx, `
@@ -50,6 +52,7 @@ func (s *Store) GetByName(ctx context.Context, executionID, name string) (*Artif
 	return &a, nil
 }
 
+// ListByExecution returns all artifacts associated with the given execution, ordered by creation time.
 func (s *Store) ListByExecution(ctx context.Context, executionID string) ([]Artifact, error) {
 	rows, err := s.DB.QueryContext(ctx, `
 		SELECT id, execution_id, step_name, name, url, size, created_at

internal/artifact/tmp.go

@@ -24,6 +24,7 @@ type FilesystemTmpStorage struct {
 	BasePath string
 }
 
+// Put copies the file at localPath to the storage location identified by key and returns its path.
 func (fs *FilesystemTmpStorage) Put(ctx context.Context, key string, localPath string) (string, error) {
 	destPath := filepath.Join(fs.BasePath, key)
 	if err := os.MkdirAll(filepath.Dir(destPath), 0755); err != nil {
@@ -49,6 +50,7 @@ func (fs *FilesystemTmpStorage) Put(ctx context.Context, key string, localPath s
 	return destPath, nil
 }
 
+// DeleteByPrefix removes all files stored under the given key prefix.
 func (fs *FilesystemTmpStorage) DeleteByPrefix(ctx context.Context, prefix string) error {
 	target := filepath.Join(fs.BasePath, prefix)
 	absBase, err := filepath.Abs(fs.BasePath)

internal/connector/docker.go

@@ -170,6 +170,7 @@ func (lw *limitWriter) Write(p []byte) (int, error) {
 	return n, err
 }
 
+// Execute runs a Docker container to completion and returns its exit code, stdout, and stderr.
 func (c *DockerRunConnector) Execute(ctx context.Context, params map[string]any) (map[string]any, error) {
 	cfg, err := parseDockerParams(params)
 	if err != nil {