Transport improvements from 2025-W20

[khaeru]

#328 ← previous PR

• (Carried from 328) Copy emission price trajectories to MESSAGEix-Transport scenarios #306
• (Carried from 328) Add a t (freight mode) dimension to the elasticity_f input data flow; adjust freight activity calculation to incorporate these values.

How to review

TBA

PR checklist

• Continuous integration checks all ✅
• Add or expand tests; coverage checks both ✅
• Add, expand, or update documentation.
• Update doc/whatsnew.

[codecov]

Codecov Report

Attention: Patch coverage is 21.05263% with 15 lines in your changes missing coverage. Please review.

Project coverage is 71.1%. Comparing base (4bc1cfa) to head (ddb1cbf).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
message_ix_models/project/engage/workflow.py	18.7%	13 Missing ⚠️
message_ix_models/model/transport/workflow.py	0.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #349     +/-   ##
=======================================
- Coverage   72.0%   71.1%   -1.0%     
=======================================
  Files        243     243             
  Lines      19451   19444      -7     
=======================================
- Hits       14011   13826    -185     
- Misses      5440    5618    +178     

Files with missing lines	Coverage Δ
message_ix_models/model/config.py	93.1% <100.0%> (+0.2%)	⬆️
...age_ix_models/tests/model/transport/test_report.py	67.9% <ø> (-24.9%)	⬇️
message_ix_models/model/transport/workflow.py	20.7% <0.0%> (-62.0%)	⬇️
message_ix_models/project/engage/workflow.py	40.6% <18.7%> (-2.3%)	⬇️

... and 12 files with indirect coverage changes

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