Add NX solver output files to bracket example

- Include .op2, .f06, .f04, .log, .diag files
- Provide complete example with all solver outputs
- Override .gitignore for example files

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

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

examples/bracket/bracket_sim1-solution_1.diag

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+*** 08:33:00 *** 
+Starting Nastran Exporter
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+*** 08:33:00 *** 
+Writing file 
+C:\Users\antoi\Documents\Atomaste\Atomizer\tests\bracket_sim1-solution_1.dat
+ 
+*** 08:33:00 *** 
+Writing SIMCENTER NASTRAN 2412.0 compatible deck
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+*** 08:33:00 *** 
+Writing Nastran System section
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+*** 08:33:00 *** 
+Writing File Management section
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+*** 08:33:00 *** 
+Writing Executive Control section
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+*** 08:33:00 *** 
+Writing Case Control section
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+*** 08:33:00 *** 
+Writing Bulk Data section
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+*** 08:33:00 *** 
+Writing Nodes
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+*** 08:33:00 *** 
+Writing Elements
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+*** 08:33:00 *** 
+Writing Physical Properties
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+*** 08:33:00 *** 
+Writing Materials
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+*** 08:33:00 *** 
+Writing Degree-of-Freedom Sets
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+*** 08:33:00 *** 
+Writing Loads and Constraints
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+*** 08:33:00 *** 
+Writing Coordinate Systems
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+*** 08:33:00 *** 
+Validating Solution Setup
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+*** 08:33:00 *** 
+Summary of Bulk Data cards written
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++----------+----------+
+|   NAME   |  NUMBER  |
++----------+----------+
+| CHEXA    | 306      |
+| CPENTA   | 10       |
+| FORCE    | 3        |
+| GRID     | 585      |
+| MAT1     | 1        |
+| MATT1    | 1        |
+| PARAM    | 6        |
+| PSOLID   | 1        |
+| SPC      | 51       |
+| TABLEM1  | 3        |
++----------+----------+
+
+*** 08:33:00 *** 
+Nastran Deck Successfully Written
+