feat: Pre-migration checkpoint - updated docs and utilities

Updates before optimization_engine migration:
- Updated migration plan to v2.1 with complete file inventory
- Added OP_07 disk optimization protocol
- Added SYS_16 self-aware turbo protocol
- Added study archiver and cleanup utilities
- Added ensemble surrogate module
- Updated NX solver and session manager
- Updated zernike HTML generator
- Added context engineering plan
- LAC session insights updates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

optimization_engine/surrogates/__init__.py

@@ -0,0 +1,19 @@
+"""
+Surrogate models for FEA acceleration.
+
+Available surrogates:
+- EnsembleSurrogate: Multiple MLPs with uncertainty quantification
+- OODDetector: Out-of-distribution detection
+"""
+
+from .ensemble_surrogate import (
+    EnsembleSurrogate,
+    OODDetector,
+    create_and_train_ensemble
+)
+
+__all__ = [
+    'EnsembleSurrogate',
+    'OODDetector',
+    'create_and_train_ensemble'
+]