🐛 Fix emission calculation and update type hints

[munechika-koyo]

Key changes include:

• Corrected the emission calculation in the emission notebook and add some graphs.

• Updated type hints for the load_wall_mesh and load_wall_outline functions.

[Copilot]

Pull request overview

This PR updates the IMAS wall-loading API typing and corrects/extends the plasma emission documentation notebook so that emission is computed consistently and additional diagnostic plots/metrics are produced.

Changes:

• Refined return type hints in wall loading helpers (notably load_wall_outline() now returns an NDArray-typed dict).
• Fixed emission accumulation logic in the emission notebook and added checks/plots (total power estimate, wavelength-band breakdown).
• Adjusted OpenADAS initialization/imports and added a repository population guard.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/cherab/imas/wall/wall.py	Adds NDArray typing and tweaks docstring return type formatting for wall loaders.
docs/notebooks/plasma/emission.ipynb	Fixes emission summation logic, improves OpenADAS setup flow, and adds additional computed outputs/plots.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.90%. Comparing base (70fc172) to head (be1b108).
⚠️ Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
src/cherab/imas/ids/wall/load3d.py	0.00%	10 Missing ⚠️
src/cherab/imas/ids/wall/load2d.py	0.00%	2 Missing ⚠️
src/cherab/imas/wall/wall.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   64.10%   63.90%   -0.21%     
==========================================
  Files          46       46              
  Lines        2811     2820       +9     
  Branches      468      468              
==========================================
  Hits         1802     1802              
- Misses        804      813       +9     
  Partials      205      205              

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[Copilot]

Pull request overview

This PR updates the plasma emission example notebook to correct how total emission is accumulated and adds additional derived plots/metrics, and it refines type annotations/documentation for IMAS wall loading helpers.

Changes:

• Adjust emission accumulation logic in Emission2DSample._emission() and extend the notebook with additional plots and total-power calculations.
• Update load_wall_outline() return type annotation to use numpy.typing.NDArray (and tweak related docstring type formatting).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/cherab/imas/wall/wall.py	Introduces NDArray typing for load_wall_outline() and adjusts return-type docstring formatting.
docs/notebooks/plasma/emission.ipynb	Fixes emission aggregation and adds total radiated power and spectrum visualizations/summary calculations.

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