Snapshot PINK DITAv2 system + Sprint 0 flaw-fix verification

First commit of the previously-untracked PINK-on-DITAv2 migration system
(execution moves to the Rust kernel; policy stays on legacy DITA, so Alpha
Engine algorithmic integrity is preserved). BLUE is untouched.

Sprint 0 (safety snapshot + flaw-fix verification, MARKET single-leg scope):
- Verified Rust FSM fixes (flaws 2,4,10,11,13) by source read of lib.rs.
- Hardened 5 vacuous/guarded assertions in test_flaws.py so each flaw test
  genuinely exercises its fix. Most important: Flaw 5 now asserts capital
  moves by EXACTLY realized PnL (was entering/exiting at the same price).
- Offline suites: 533 passed, 0 failed (35 flaws + 402 kernel/accounting/
  bridge + 96 runtime/persistence/multi-exit/restart/seams).
- GATE PASS: MARKET-path-critical flaws 1,2,5 confirmed fixed + green.
- Added SPRINT0_FLAW_VERIFICATION.md report and _rust_kernel/.gitignore
  (excludes Rust target/ build artifacts).

LIMIT/partial-fill remain explicitly out of scope (MARKET-only bring-up).

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

prod/clean_arch/dita_v2/__init__.py

@@ -0,0 +1,95 @@
+"""DITA v2 prototype kernel.
+
+This package is intentionally separate from the legacy v1 DITA surface so the
+new execution kernel can be validated in isolation before any migration.
+"""
+
+from .account import AccountProjection, AccountSnapshot
+from .control import (
+    BackendMode,
+    ControlPlane,
+    ControlUpdate,
+    build_control_plane,
+    InMemoryControlPlane,
+    KernelControlSnapshot,
+    KernelMode,
+    KernelVerbosity,
+    MirroredControlPlane,
+    ZincControlPlane,
+)
+from .contracts import (
+    KernelCommandType,
+    KernelDiagnosticCode,
+    KernelEventKind,
+    KernelIntent,
+    KernelOutcome,
+    KernelSeverity,
+    KernelTransition,
+    TradeSide,
+    TradeSlot,
+    TradeStage,
+    VenueEvent,
+    VenueEventStatus,
+    VenueOrder,
+    VenueOrderStatus,
+)
+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
+from .zinc_plane import InMemoryZincPlane, ZincPlane
+from .real_zinc_plane import RealZincPlane, RealZincUnavailable
+from .real_control_plane import RealZincControlPlane, RealZincUnavailable as RealZincControlUnavailable
+
+__all__ = [
+    "AccountProjection",
+    "AccountSnapshot",
+    "BackendMode",
+    "BingxVenueAdapter",
+    "ClickHouseKernelJournal",
+    "ControlPlane",
+    "ControlUpdate",
+    "DITAv2LauncherBundle",
+    "build_control_plane",
+    "build_launcher_bundle",
+    "ExecutionKernel",
+    "HazelcastProjection",
+    "build_projection",
+    "InMemoryControlPlane",
+    "InMemoryZincPlane",
+    "KernelCommandType",
+    "KernelDiagnosticCode",
+    "KernelControlSnapshot",
+    "KernelEventKind",
+    "KernelIntent",
+    "KernelJournal",
+    "KernelMode",
+    "KernelOutcome",
+    "KernelSeverity",
+    "KernelTransition",
+    "KernelVerbosity",
+    "MemoryKernelJournal",
+    "MirroredControlPlane",
+    "MockVenueAdapter",
+    "MockVenueScenario",
+    "LauncherVenueMode",
+    "LauncherZincMode",
+    "RealZincPlane",
+    "RealZincControlPlane",
+    "RealZincControlUnavailable",
+    "RealZincUnavailable",
+    "TradeSide",
+    "TradeSlot",
+    "TradeStage",
+    "VenueAdapter",
+    "VenueEvent",
+    "VenueEventStatus",
+    "VenueOrder",
+    "VenueOrderStatus",
+    "ZincPlane",
+    "ZincControlPlane",
+    "build_position_state_row",
+]