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>

templates/agent-file-template.md

@@ -0,0 +1,23 @@
+# [PROJECT NAME] Development Guidelines
+
+Auto-generated from all feature plans. Last updated: [DATE]
+
+## Active Technologies
+[EXTRACTED FROM ALL PLAN.MD FILES]
+
+## Project Structure
+```
+[ACTUAL STRUCTURE FROM PLANS]
+```
+
+## Commands
+[ONLY COMMANDS FOR ACTIVE TECHNOLOGIES]
+
+## Code Style
+[LANGUAGE-SPECIFIC, ONLY FOR LANGUAGES IN USE]
+
+## Recent Changes
+[LAST 3 FEATURES AND WHAT THEY ADDED]
+
+<!-- MANUAL ADDITIONS START -->
+<!-- MANUAL ADDITIONS END -->