docs: Update protocol docs and method selector improvements

- SYS_12: Add extractor library updates
- SYS_15: Add method selector documentation updates
- method_selector.py: Minor improvements to method selection logic

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

docs/protocols/system/SYS_15_METHOD_SELECTOR.md

@@ -385,6 +385,25 @@ if user_confirms:
 | PURE_FEA recommended | High dimensionality | Consider dimension reduction |
 | GNN_FIELD recommended | Need field visualization | Set up atomizer-field |
 
+### Config Format Compatibility
+
+The method selector supports multiple config JSON formats:
+
+| Old Format | New Format | Both Supported |
+|------------|------------|----------------|
+| `parameter` | `name` | Variable name |
+| `bounds: [min, max]` | `min`, `max` | Variable bounds |
+| `goal` | `direction` | Objective direction |
+
+**Example equivalent configs:**
+```json
+// Old format (UAV study style)
+{"design_variables": [{"parameter": "angle", "bounds": [30, 60]}]}
+
+// New format (beam study style)
+{"design_variables": [{"name": "angle", "min": 30, "max": 60}]}
+```
+
 ---
 
 ## Cross-References
@@ -418,5 +437,6 @@ optimization_engine/
 
 | Version | Date | Changes |
 |---------|------|---------|
+| 2.1 | 2025-12-07 | Added config format flexibility (parameter/name, bounds/min-max, goal/direction) |
 | 2.0 | 2025-12-07 | Added NNQualityAssessor with relative accuracy thresholds |
 | 1.0 | 2025-12-06 | Initial implementation with 4 methods |