Audita API key credentials are now optional

internal/config/load_validate_test.go

@@ -412,27 +412,6 @@ inputs:
 `,
 			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.timeout must be a valid duration",
 		},
-		{
-			name: "empty audita llm_api_key_env fails",
-			pipelineYAML: `workspace:
-  root: /tmp/narratio
-whisperx:
-  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
-seriatim:
-  binary: seriatim
-audita:
-  binary: audita
-  llm_api_key_env: "   "
-`,
-			sessionYAML: `session_id: 2026-05-03
-inputs:
-  audio_dir: ./audio
-  speakers_file: ./speakers.yml
-  autocorrect_file: ./autocorrect.yml
-  glossary_file: ./glossary.yml
-`,
-			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.llm_api_key_env is required",
-		},
 		{
 			name: "empty audita modules fails",
 			pipelineYAML: `workspace: