Add SHA to dependencies and update CHANGELOG

- Add SHA package to Project.toml dependencies
- Update CHANGELOG.md with TDR hash verification feature in keepachangelog format

Co-authored-by: gschivley <10373332+gschivley@users.noreply.github.com>

Author: Copilot

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+- Hash-based validation of Time Domain Reduction (TDR) input files to automatically detect changes. GenX now stores SHA256 hashes of time series input files (`Demand_data.csv`, `Generators_variability.csv`, `Fuels_data.csv`) and TDR settings in `tdr_input_hashes.yml`. When TDR results exist, GenX compares stored hashes with current files and automatically re-runs TDR if any changes are detected, eliminating the need to manually delete the TDR_Results folder (#844).
+
 ## [0.4.5] - 2025-07-07
 
 ### Added

Project.toml

@@ -19,6 +19,7 @@ MathOptInterface = "b8f27783-ece8-5eb3-8dc8-9495eed66fee"
 PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 RecursiveArrayTools = "731186ca-8d62-57ce-b412-fbd966d074cd"
+SHA = "ea8e919c-243c-51af-8825-aaa63cd721ce"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 YAML = "ddb6d928-2868-570f-bddf-ab3f9cf99eb6"