feat(adapters): conformance suite — profiles verified not asserted (WP-0007 T4)

run_conformance/assert_conformant verify declared profile == observed behaviour
(profile validates, READ round-trips to the right shard, unclaimed verbs raise
NotSupported); ConformanceReport gives a precise capability diff. FolderAdapter
passes; lying-read and dishonest-write stubs fail. 3 tests green. (TSD §A.2)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/shard_wiki/adapters/__init__.py

@@ -1,6 +1,22 @@
 """adapters/ — the shard adapter contract (bottom waist) and concrete adapters."""
 
+from shard_wiki.adapters.conformance import (
+    Check,
+    ConformanceError,
+    ConformanceReport,
+    assert_conformant,
+    run_conformance,
+)
 from shard_wiki.adapters.contract import CONTRACT_VERSION, ShardAdapter
 from shard_wiki.adapters.folder import FolderAdapter
 
-__all__ = ["ShardAdapter", "FolderAdapter", "CONTRACT_VERSION"]
+__all__ = [
+    "ShardAdapter",
+    "FolderAdapter",
+    "CONTRACT_VERSION",
+    "Check",
+    "ConformanceReport",
+    "ConformanceError",
+    "run_conformance",
+    "assert_conformant",
+]