feat: Add Adaptive Method Selector for intelligent optimization strategy

The AMS analyzes optimization problems and recommends the best method:
- ProblemProfiler: Static analysis of config (dimensions, objectives, constraints)
- EarlyMetricsCollector: Dynamic analysis from FEA trials (smoothness, correlations)
- AdaptiveMethodSelector: Rule-based scoring for method recommendations
- RuntimeAdvisor: Mid-run monitoring for method pivots

Key features:
- Analyzes problem characteristics (n_variables, n_objectives, constraints)
- Computes response smoothness and variable sensitivity from trial data
- Recommends TURBO, HYBRID_LOOP, PURE_FEA, or GNN_FIELD
- Provides confidence scores and suggested parameters
- CLI: python -m optimization_engine.method_selector <config> [db]

Documentation:
- Add SYS_15_METHOD_SELECTOR.md protocol
- Update CLAUDE.md with new system protocol reference

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

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

CLAUDE.md

@@ -48,6 +48,7 @@ The Protocol Operating System (POS) provides layered documentation:
 | 12 | Extractor Library | Any extraction, "displacement", "stress" |
 | 13 | Dashboard | "dashboard", "real-time", monitoring |
 | 14 | Neural Acceleration | >50 trials, "neural", "surrogate" |
+| 15 | Method Selector | "which method", "recommend", "turbo vs" |
 
 **Full specs**: `docs/protocols/system/SYS_{N}_{NAME}.md`
 
@@ -72,7 +73,7 @@ Atomizer/
 ├── .claude/skills/           # LLM skills (Bootstrap + Core + Modules)
 ├── docs/protocols/           # Protocol Operating System
 │   ├── operations/           # OP_01 - OP_06
-│   ├── system/              # SYS_10 - SYS_14
+│   ├── system/              # SYS_10 - SYS_15
 │   └── extensions/          # EXT_01 - EXT_04
 ├── optimization_engine/     # Core Python modules
 │   └── extractors/          # Physics extraction library