chore: add EditorConfig for consistent coding styles

Add .editorconfig to maintain consistent formatting across editors:
- Python: 4 spaces, max line 88 (matches black)
- YAML/JSON: 2 spaces
- Unix line endings (LF)
- UTF-8 encoding
- Trim trailing whitespace

Author: bakerboy448

.editorconfig

@@ -0,0 +1,56 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# Python files
+[*.py]
+indent_style = space
+indent_size = 4
+max_line_length = 88
+
+# JSON files
+[*.json]
+indent_style = space
+indent_size = 2
+
+# YAML files
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+max_line_length = off
+
+# Shell scripts
+[*.sh]
+indent_style = space
+indent_size = 2
+
+# Dockerfile
+[Dockerfile*]
+indent_style = space
+indent_size = 2
+
+# Docker Compose
+[docker-compose*.yml]
+indent_style = space
+indent_size = 2
+
+# Makefile
+[Makefile]
+indent_style = tab
+
+# Configuration files
+[*.{cfg,ini,toml}]
+indent_style = space
+indent_size = 2