Add load_rotor_from_file MCP tool

[raphaeltimbo]

Summary

• Add load_rotor_from_file MCP tool that loads a rotor from a .json or .toml file into server state, enabling AI-assisted analysis of user-saved rotor models
• Include a compressor example JSON file in ross/tests/data/ for testing and demonstration

Test plan

• Verify the MCP tool loads .json rotor files correctly
• Verify the MCP tool loads .toml rotor files correctly
• Verify appropriate error messages for missing files and unsupported formats
• Verify the loaded rotor can be used with other MCP tools (modal analysis, Campbell diagram, etc.)

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.54%. Comparing base (a71eded) to head (22e3667).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
ross/mcp/server.py	0.00%	14 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1261      +/-   ##
==========================================
- Coverage   77.57%   77.54%   -0.03%     
==========================================
  Files          48       48              
  Lines       13310    13361      +51     
==========================================
+ Hits        10325    10361      +36     
- Misses       2985     3000      +15     

Files with missing lines	Coverage Δ
ross/mcp/server.py	0.00% <0.00%> (ø)

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