feat: add missing project files and fix architecture compliance

- Add LICENSE file (MIT)
- Add CONTRIBUTING.md with generator-first workflow guidelines
- Add Makefile with comprehensive development commands
- Add .editorconfig for consistent code formatting
- Add CHANGELOG.md for version tracking
- Remove inconsistent non-variant files that bypassed generator architecture
- Fix installation script to use variant-specific paths (prevent config overwriting)

terminals/windows-terminal/template.json

@@ -0,0 +1,24 @@
+{
+  "name": "Everforest",
+  "comment": "Everforest theme for Windows Terminal - Generated from template - do not edit manually",
+  "background": "{{bg}}",
+  "foreground": "{{fg}}",
+  "selectionBackground": "{{bg1}}",
+  "cursorColor": "{{fg}}",
+  "black": "{{bg}}",
+  "red": "{{red}}",
+  "green": "{{green}}",
+  "yellow": "{{yellow}}",
+  "blue": "{{blue}}",
+  "purple": "{{purple}}",
+  "cyan": "{{aqua}}",
+  "white": "{{fg}}",
+  "brightBlack": "{{gray1}}",
+  "brightRed": "{{red}}",
+  "brightGreen": "{{green}}",
+  "brightYellow": "{{yellow}}",
+  "brightBlue": "{{blue}}",
+  "brightPurple": "{{purple}}",
+  "brightCyan": "{{aqua}}",
+  "brightWhite": "{{fg}}"
+}