Update version (#203)

* Update version

* Add changelog

* Update version

Author: tbittar

docs/CHANGELOG.md

@@ -1 +1,89 @@
-# Changelog
+# Changelog
+
+All notable changes to GemsPy are documented here.
+
+## [0.1.0] - 2026-04-30
+
+### Study folder structure
+
+Studies are now loaded from a conventional directory layout via `load_study(study_dir)`:
+
+```
+<study>/
+  input/
+    system.yml                          # component topology and connections
+    model-libraries/*.yml               # model library files
+    data-series/                        # time-series parameter files (TSV)
+    data-series/modeler-scenariobuilder.dat   # optional scenario mapping
+```
+
+The `Study` object (pairing a `System` with a `DataBase`) is the single input to `SimulationSession`.
+
+### Optimization configuration (`optim-config.yml`)
+
+A new `optim-config.yml` file controls all aspects of a simulation run:
+
+- **`resolution.mode`** — four strategies: `frontal`, `sequential-subproblems`, `parallel-subproblems`, `benders-decomposition`
+- **`resolution.block_length` / `block_overlap`** — time-window size and overlap for sequential/parallel modes
+- **`time_scope`** — `first_time_step` / `last_time_step`
+- **`scenario_scope.nb_scenarios`** — number of Monte-Carlo scenarios to run
+- **`solver_options`** — solver name (default: HiGHS), log verbosity, and free-form solver parameters
+- **`models[].model_decomposition`** — per-model assignment of variables, constraints, and objective contributions to `master`, `subproblems`, or `master-and-subproblems` (used for Benders decomposition)
+- **`models[].out_of_bounds_processing`** — per-constraint handling of time indices that fall outside the horizon (`cyclic` or `drop`)
+
+### Scenario builder
+
+`modeler-scenariobuilder.dat` maps Monte-Carlo scenario indices to data-series column indices on a per-scenario-group basis, allowing different components to draw from different stochastic draws.
+
+### Vectorized solver
+
+The internal optimizer was migrated from a scalar OR-Tools pipeline to a fully vectorized [linopy](https://github.com/PyPSA/linopy) / xarray pipeline. All constraints for all components, time steps, and scenarios are now built in a single pass and solved in one call — significantly reducing build time for large horizons.
+
+### Removed
+- OR-Tools dependency.
+
+---
+
+## [0.0.6] - 2025
+
+### Added
+- Math operators `floor`, `ceil`, `min`, and `max` in the GemsPy expression language, with `max`/`min` accepting a variadic argument list (`argList` grammar rule).
+- Support for complex variable bounds expressions: operator expansion now runs before bounds evaluation, enabling expressions such as `min(p_max_cluster, min_gen_mod * unit_count * p_max_unit)`.
+- `visitTimeShiftExpr` and `visitTimeIndexExpr` in the expression visitor interface.
+- `AGENTS.md` and agent guidance documentation.
+- Status and quality badges in README.
+
+### Fixed
+- O(T²) list-copy performance bug in `CopyVisitor.addition` (now O(T)).
+- Pandas and Pydantic deprecation warnings resolved.
+- `floor`/`ceil`/`max`/`min` visitor implementations in `LinearExpressionBuilder`.
+- Degree of `floor`/`ceil`/`max`/`min` returns `inf` for non-constant operands.
+
+---
+
+## [0.0.5] - 2025
+
+### Added
+- `load_input_system`: load and validate an input system into memory from a file path.
+
+---
+
+## [0.0.4] - 2025
+
+### Removed
+- PyPSA → GEMS converter and related files (out of scope).
+
+---
+
+## [0.0.3] - 2025
+
+### Changed
+- Version naming aligned; package prepared for PyPI upload.
+- README revised to consistently use GEMS / GemsPy naming.
+
+---
+
+## [0.0.2] - 2025
+
+### Changed
+- Initial PyPI preparation: project metadata, classifiers, and packaging configuration.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "gemspy"
-version = "0.0.6"
+version = "0.1.0"
 description = "Python interpreter for GEMS: modelling and simulation of complex energy systems under uncertainty"
 readme = "README.md"
 license = { file = "LICENSE" }