feat: Add LLM-native development roadmap and reorganize documentation

- Add DEVELOPMENT_ROADMAP.md with 7-phase plan for LLM-driven optimization
  - Phase 1: Plugin system with lifecycle hooks
  - Phase 2: Natural language configuration interface
  - Phase 3: Dynamic code generation for custom objectives
  - Phase 4: Intelligent analysis and decision support
  - Phase 5: Automated HTML/PDF reporting
  - Phase 6: NX MCP server integration
  - Phase 7: Self-improving feature registry

- Update README.md to reflect LLM-native philosophy
  - Emphasize natural language workflows
  - Link to development roadmap
  - Update architecture diagrams
  - Add future capability examples

- Reorganize documentation structure
  - Move old dev docs to docs/archive/
  - Clean up root directory
  - Preserve all working optimization engine code

This sets the foundation for transforming Atomizer into an AI-powered
engineering assistant that can autonomously configure optimizations,
generate custom analysis code, and provide intelligent recommendations.

examples/bracket/bracket_sim1-solution_1.diag

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 Starting Nastran Exporter
 
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 Writing file 
 C:\Users\antoi\Documents\Atomaste\Atomizer\examples\bracket\bracket_sim1-solution_1.dat
  
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 Writing SIMCENTER NASTRAN 2412.0 compatible deck
 
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 Writing Case Control section
 
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 Validating Solution Setup
 
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 Summary of Bulk Data cards written
 
 +----------+----------+
 |   NAME   |  NUMBER  |
 +----------+----------+
-| CTETRA   | 941      |
+| CTETRA   | 1079     |
 | FORCE    | 5        |
-| GRID     | 1910     |
+| GRID     | 2133     |
 | MAT1     | 1        |
 | MATT1    | 1        |
 | PARAM    | 6        |
@@ -65,6 +65,6 @@ Summary of Bulk Data cards written
 | TABLEM1  | 3        |
 +----------+----------+
 
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 Nastran Deck Successfully Written