[GP-01] Remove model-libraries field

[Juliette-Gerbaux]

New GEMS Language Version

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Previous Tracked Version

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Trigger

Removal of model-libraries field in system files

Impact Analysis

The model-libraries field should not be parsed anymore. It should either be ignored or raise an error.

Validation Strategy

The model-libraries field should be removed from test studies.

Process Checklist

Step 1 — Issue Creation

• Issue created and linked to process GP-01

Step 2 — Triage

• Process confirmed applicable
• Assigned to responsible contributor
• Priority and milestone set (if applicable)

Step 3 — Impact Analysis

• GEMS Language changelog reviewed for GemsPy-relevant changes
• Grammar impact assessed (grammar/Expr.g4)
• Parsing layer impact assessed (expression/, ANTLR-generated files)
• Execution layer impact assessed (simulation/, study/)
• Version-gated behavior required? (yes/no — document decision)
• Results impact assessed (solver values expected to change?)
• Breaking vs backward-compatible change identified

Step 4 — Implementation ⚠️ version-gated behavior may be required

• Grammar updated (grammar/Expr.g4) if needed — do not edit ANTLR-generated files directly
• ANTLR parser regenerated if grammar changed
• Parsing and execution layers updated (expression/, simulation/, study/)
• Version-gated behavior introduced if GemsPy must support both old and new syntax

Step 5 — Testing & Validation ⚠️ regression suite covering old and new syntax required

• At least one reference E2E study validating new language feature added or updated
• Regression tests covering old syntax still pass
• If results expected to change: before/after comparison documented
• If results must not change: confirmed via tests

Step 6 — CI Validation

• Type checking passes (mypy)
• Formatting passes (black, isort)
• All tests pass in CI (pytest)

Step 7 — Review & Merge

• PR reviewed; documentation changes included

Step 8 — Versioning

• pyproject.toml version bumped (Major if breaking language change, Minor otherwise)

Step 9 — Supporting Files

• AGENTS.md reviewed for impact and updated if needed

Step 10 — Release

• If a release is needed: follow the release process in the Developer Guidelines