biochar 2030 bounds

[tabeado]

Purpose of this PR

Add an upper bound on biochar for 2030. Assumption is a maximum annual growth rate of 70%.
For reference, the compounded annual growth rate in the 2020s has reached 60% in Europe.

There is no influence on default scenarios. Only relevant to avoid large increases where there are strong mitigation pressure and geologic CO2 storage constraints.

Type of change

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Parts concerned

• ☑️ GAMS Code
• ◻️ R-scripts
• ◻️ Documentation (GAMS incode documentation, comments, tutorials)
• ◻️ Input data / CES parameters
• ◻️ Tests, CI/CD (continuous integration/deployment)
• ◻️ Configuration (switches in main.gms, default.cfg, and scenario_config*.csv files)
• ◻️ Other (please give a description)

Impact

• ◻️ Bug fix
• ◻️ Refactoring
• ◻️ New feature
• ☑️ Change of parameter values or input data (including CES parameters)
• ☑️ Minor change (default scenarios show only small differences)
• ◻️ Fundamental change of results of default scenarios

Checklist

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In the end all checkboxes must be ticked before you can merge.

• I executed the automated model tests (make test) after my final commit and all tests pass (FAIL 0)
• I adjusted the reporting in remind2 if and where it was needed
• I adjusted the madrat packages (mrremind and other packages involved) for input data generation if and where it was needed
• My code follows the coding etiquette
• I explained my changes within the PR, particularly in hard-to-understand areas
• I checked that the in-code documentation is up-to-date
• I adjusted forbiddenColumnNames in readCheckScenarioConfig.R in case the PR leads to deprecated switches
• I updated the CHANGELOG.md correctly (added, changed, fixed, removed, input data/calibration)

Further information (optional)

• Runs with these changes are here:
• Comparison of results (what changes by this PR?):

[Copilot]

Pull request overview

Adds a near-term capacity upper bound for biochar/pyrolysis technologies in 2030 to prevent implausibly large scale-ups under strong mitigation pressure and limited geologic CO₂ storage, assuming a 70% maximum annual growth rate.

Changes:

• Keeps the 2025 upper bound at 70% above the 2025 lower bound derived from 2024 values.
• Introduces a 2030 upper bound by compounding the 2025 upper bound with a 70% annual growth factor over 5 years.

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