Refactor repository structure to match fz-Model template

[Copilot]

Aligns fz-MCNP with the standard fz-Model template structure for consistency across Funz plugin repositories.

Directory Structure

• Move example files to examples/ (flattened from root, no subdirectory)
• Add tests/test_plugin.py with validation suite (model files, calculator configs, example files, fz integration)

Naming Convention

• Rename .fz/calculators/Localhost_MCNP.json → localhost_MCNP.json
• Update all references (Localhost_MCNP → localhost_MCNP) across documentation

Documentation

• Remove unnecessary documentation files: CONTRIBUTING.md, MIGRATION.md, QUICKSTART.md
• Keep only README.md and LICENSE to match template
• Update paths to reference examples/godiva.inp
• Simplify .gitignore (43 lines removed)

CI/CD

• Add .github/workflows/ci.yml with comprehensive tests:
  • JSON validation for models and calculators
  • Shell script syntax checking
  • fz framework integration tests
  • Plugin structure validation
  • Documentation checks

Jupyter Notebook

• Add example_usage.ipynb demonstrating:
  • Installation and setup
  • Variable parsing and compilation
  • Running MCNP calculations
  • Parametric studies
  • Result visualization

Before:

results = fz.fzr("godiva.inp", {"r": [8.5, 8.741, 9.0]}, "MCNP", 
                 calculators="Localhost_MCNP")

After:

results = fz.fzr("examples/godiva.inp", {"r": [8.5, 8.741, 9.0]}, "MCNP",
                 calculators="localhost_MCNP")

The repository now matches the canonical structure used by other fz-* plugins.

Original prompt

refactor repository to match template fz-Model

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[yannrichet-asnr]

@copilot go closer to template fz-Model: most .md files are not needed, CI missing, notebook missing, subdir examples/MCNP not needed

[Copilot]

@copilot go closer to template fz-Model: most .md files are not needed, CI missing, notebook missing, subdir examples/MCNP not needed

Done! Changes made to match fz-Model template:

1. ✅ Removed CONTRIBUTING.md, MIGRATION.md, QUICKSTART.md (only README.md and LICENSE remain)
2. ✅ Added .github/workflows/ci.yml with tests for structure validation
3. ✅ Added example_usage.ipynb notebook
4. ✅ Flattened examples/ directory (files moved from examples/MCNP/ to examples/ directly)

Final structure now matches fz-Model exactly. See commits 4d2b539 and c4fc844.