chore: add spec-kit and standardize signatures

- Added GitHub spec-kit for development workflow
- Standardized file signatures to Descomplicar® format
- Updated development configuration

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.editorconfig

@@ -0,0 +1,48 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# All files
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+indent_size = 4
+
+# JSON, YAML, Markdown files
+[*.{json,yml,yaml,md}]
+indent_style = space
+indent_size = 2
+
+# PHP files - WordPress standards
+[*.php]
+indent_style = tab
+indent_size = 4
+max_line_length = 120
+
+# JavaScript and CSS files
+[*.{js,css,scss,sass}]
+indent_style = tab
+indent_size = 4
+
+# Configuration files
+[*.{xml,ini,conf}]
+indent_style = tab
+indent_size = 4
+
+# Shell scripts
+[*.{sh,bash}]
+indent_style = tab
+indent_size = 4
+
+# Make files
+[{Makefile,makefile,*.mk}]
+indent_style = tab
+indent_size = 4
+
+# Specific WordPress files
+[{*.txt,LICENSE,README}]
+trim_trailing_whitespace = false