refactor(evidence): migrate acquisition and preprocessing (#30)

harness/tht/adapters/evidence/filesystem.py

@@ -7,7 +7,7 @@ from datetime import UTC, datetime
 from pathlib import Path, PurePosixPath
 from urllib.parse import unquote, urlsplit
 
-from tht.ports.evidence import (
+from tht.evidence.contracts import (
     AcquiredDocument,
     EvidenceSourceError,
     EvidenceSourceErrorCategory,

harness/tht/adapters/evidence/http.py

@@ -10,7 +10,7 @@ from urllib.parse import urljoin, urlsplit
 
 import requests
 
-from tht.ports.evidence import (
+from tht.evidence.contracts import (
     AcquiredDocument,
     EvidenceSourceError,
     EvidenceSourceErrorCategory,

harness/tht/adapters/evidence/s3.py

@@ -6,7 +6,7 @@ import re
 from datetime import UTC, datetime
 from urllib.parse import quote, urlsplit
 
-from tht.ports.evidence import (
+from tht.evidence.contracts import (
     AcquiredDocument, EvidenceSourceError, EvidenceSourceErrorCategory, SourceObject,
 )