chore: replace .gitignore with research-appropriate rules

.gitignore

@@ -1,30 +1,39 @@
-# ---> Go
+# Go build artifacts
-# If you prefer the allow list template instead of the deny list, see community template:
+bin/
-# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
-#
-# Binaries for programs and plugins
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-
-# Test binary, built with `go test -c`
 *.test
-
-# Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
-# Dependency directories (remove the comment below to include it)
+# Go workspace
-# vendor/
-
-# Go workspace file
 go.work
 go.work.sum
 
-# env file
+# Environment
 .env
 
-# Project-specific
+# Python
-bin/
+model/.venv/
-*.templ.go
+model/__pycache__/
+model/**/__pycache__/
+model/**/*.pyc
+model/.pytest_cache/
+model/**/.pytest_cache/
+model/.ruff_cache/
+
+# Data — never commit raw or processed FX data
+data/raw/
+data/processed/
+data/cache/
+
+# Experiment outputs — commit summaries only (results/summaries/)
+experiments/*/embeddings/
+experiments/*/checkpoints/
+experiments/*/logs/
+
+# Large results — commit metric tables and figures only
+results/raw/
+
+# Notebooks — never commit outputs
+notebooks/**/.ipynb_checkpoints/
+
+# OS
+.DS_Store