dita_v2: reconcile SOA — vendored thread-safety hardening ∪ venue plane

3-way merge (base=pre-venue-plane upstream, ours=violet-main vendored hardening,
theirs=upstream venue plane): RLock atomic-snapshot wrapping (account.py,
real_control_plane, real_zinc_plane), lazy __getattr__ imports (__init__),
account-core test coverage — merged with venue_region telemetry. Zero conflicts;
all files AST-verified. Ends the two-way vendor drift found in
DITAV2_SOA_SURVEY_20260702 §5 / UV_DITAV2_SOA_VERDICT_20260703.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

prod/clean_arch/dita_v2/__init__.py

@@ -36,8 +36,6 @@ from .contracts import (
 )
 from .journal import ClickHouseKernelJournal, KernelJournal, MemoryKernelJournal
 from .rust_backend import ExecutionKernel
-from .bingx_venue import BingxVenueAdapter
-from .launcher import DITAv2LauncherBundle, LauncherVenueMode, LauncherZincMode, build_launcher_bundle
 from .projection import HazelcastProjection, build_position_state_row, build_projection
 from .venue import VenueAdapter
 from .mock_venue import MockVenueAdapter, MockVenueScenario
@@ -45,6 +43,28 @@ from .zinc_plane import InMemoryZincPlane, ZincPlane
 from .real_zinc_plane import RealZincPlane, RealZincUnavailable
 from .real_control_plane import RealZincControlPlane, RealZincUnavailable as RealZincControlUnavailable
 
+
+def __getattr__(name: str):
+    if name == "BingxVenueAdapter":
+        from .bingx_venue import BingxVenueAdapter
+
+        return BingxVenueAdapter
+    if name in {"DITAv2LauncherBundle", "LauncherVenueMode", "LauncherZincMode", "build_launcher_bundle"}:
+        from .launcher import (
+            DITAv2LauncherBundle,
+            LauncherVenueMode,
+            LauncherZincMode,
+            build_launcher_bundle,
+        )
+
+        return {
+            "DITAv2LauncherBundle": DITAv2LauncherBundle,
+            "LauncherVenueMode": LauncherVenueMode,
+            "LauncherZincMode": LauncherZincMode,
+            "build_launcher_bundle": build_launcher_bundle,
+        }[name]
+    raise AttributeError(name)
+
 __all__ = [
     "AccountProjection",
     "AccountSnapshot",