add some stuff

[ryanbieber]

This pull request introduces several enhancements and clarifications to the Farseer repository, with a focus on improving support and documentation for conditional seasonalities, floor parameters, and model serialization. The changes span user-facing documentation, Python and Rust APIs, and internal data structures, ensuring consistency and feature completeness across the stack.

Key highlights:

• The documentation for contributors is significantly expanded, providing clear guidance on conventions, scaling, regressors, floor handling, conditional seasonalities, model serialization, and testing.
• Conditional seasonalities are now fully supported and documented, with corresponding changes in both Python and Rust APIs.
• Internal data structures are updated to support floor and condition columns, aligning with Prophet compatibility.
• Model serialization and deserialization are clarified, with explicit notes about limitations due to PyO3.
• Minor improvements to pre-commit configuration and test coverage for new/changed parameters.

---

Documentation and Contributor Guidance

• Major expansion of .github/copilot-instructions.md to detail repository conventions, scaling logic, regressor standardization, floor parameter handling, conditional seasonalities, model estimation, serialization limitations, and testing practices. This provides a comprehensive reference for contributors and automated coding assistants.

Conditional Seasonality Support

• Python API (farseer/__init__.py): Added a condition_name parameter to add_seasonality, with updated docstrings and method signature to allow specifying conditional seasonalities. [1] [2]
• Rust core (src/core/model.rs, src/core/data.rs):
  • SeasonalityConfig struct now includes an optional condition_name field, with builder method with_condition. [1] [2] [3]
  • TimeSeriesData struct now includes a conditions field and methods for adding condition columns, supporting boolean masks for conditional seasonalities. [1] [2] [3]

Floor Parameter and Data Structure Enhancements

• TimeSeriesData struct now includes an optional floor field and a with_floor method, supporting logistic growth with saturating minimum and aligning with Prophet's behavior. [1] [2]

Model Serialization and Deserialization

• Python API: Added from_json class method to Farseer for deserializing models from JSON strings, with explicit documentation of the PyO3 limitation (loaded models require pandas DataFrames for prediction).

Testing and Pre-commit Improvements

• Rust integration tests updated to use the new add_seasonality signature with condition_name parameter, ensuring test coverage for additive/multiplicative/conditional seasonalities. [1] [2] [3] [4] [5] [6]
• Pre-commit configuration: Ruff linter and formatter are now excluded from running on .ipynb files, reducing noise in notebook-based workflows.