feat: Complete Phase 3 - pyNastran Documentation Integration

Phase 3 implements automated OP2 extraction code generation using
pyNastran documentation research. This completes the zero-manual-coding
pipeline for FEA optimization workflows.

Key Features:
- PyNastranResearchAgent for automated OP2 code generation
- Documentation research via WebFetch integration
- 3 core extraction patterns (displacement, stress, force)
- Knowledge base architecture for learned patterns
- Successfully tested on real OP2 files

Phase 2.9 Integration:
- Updated HookGenerator with lifecycle hook generation
- Added POST_CALCULATION hook point to hooks.py
- Created post_calculation/ plugin directory
- Generated hooks integrate seamlessly with HookManager

New Files:
- optimization_engine/pynastran_research_agent.py (600+ lines)
- optimization_engine/hook_generator.py (800+ lines)
- optimization_engine/inline_code_generator.py
- optimization_engine/plugins/post_calculation/
- tests/test_lifecycle_hook_integration.py
- docs/SESSION_SUMMARY_PHASE_3.md
- docs/SESSION_SUMMARY_PHASE_2_9.md
- docs/SESSION_SUMMARY_PHASE_2_8.md
- docs/HOOK_ARCHITECTURE.md

Modified Files:
- README.md - Added Phase 3 completion status
- optimization_engine/plugins/hooks.py - Added POST_CALCULATION hook

Test Results:
- Phase 3 research agent: PASSED
- Real OP2 extraction: PASSED (max_disp=0.362mm)
- Lifecycle hook integration: PASSED

Generated with Claude Code

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

generated_hooks/hook_registry.json

@@ -0,0 +1,54 @@
+{
+  "hooks": [
+    {
+      "name": "hook_weighted_objective_norm_stress_norm_disp.py",
+      "type": "weighted_objective",
+      "description": "Combine normalized stress (70%) and displacement (30%)",
+      "inputs": [
+        "norm_stress",
+        "norm_disp"
+      ],
+      "outputs": [
+        "weighted_objective"
+      ]
+    },
+    {
+      "name": "hook_custom_safety_factor.py",
+      "type": "custom_formula",
+      "description": "Calculate safety factor",
+      "inputs": [
+        "max_stress",
+        "yield_strength"
+      ],
+      "outputs": [
+        "safety_factor"
+      ]
+    },
+    {
+      "name": "hook_compare_min_to_avg_ratio.py",
+      "type": "comparison",
+      "description": "Compare min force to average",
+      "inputs": [
+        "min_force",
+        "avg_force"
+      ],
+      "outputs": [
+        "min_to_avg_ratio"
+      ]
+    },
+    {
+      "name": "hook_constraint_yield_constraint.py",
+      "type": "constraint_check",
+      "description": "Check if stress is below yield",
+      "inputs": [
+        "max_stress",
+        "yield_strength"
+      ],
+      "outputs": [
+        "yield_constraint",
+        "yield_constraint_satisfied",
+        "yield_constraint_violation"
+      ]
+    }
+  ]
+}