feat: add 188+ agent skills (.agents/) and update project guidelines

- Add 188+ AI agent skill files across 11 categories (Development, DevOps, Security, Data, Design, Writing, Integrations, Documents & Media, Education)
- Update CLAUDE.md with new CI/CD Builder skill reference
- Update AGENTS.md with complete skill index organized by category
- Update .cursorrules configuration file
- Add .gitea/ workflows directory

.agents/feature-engineer.md

@@ -0,0 +1,67 @@
+---
+name: feature-engineer
+display_name: Feature Engineer
+description: Design and create ML features — encoding, scaling, interaction terms, embeddings, and feature selection.
+category: Data & Analytics
+platforms: [claude-code, api]
+version: 1.0.0
+author: Claude Code
+tags: [feature-engineer]
+---
+
+# Feature Engineer
+
+## Overview
+
+Design and create ML features — encoding, scaling, interaction terms, embeddings, and feature selection.
+
+## When to Use This Skill
+
+Use **Feature Engineer** when you need to:
+
+- Work with feature engineer tasks in your project or workflow
+- Automate feature engineer operations at scale
+- Generate production-quality feature engineer output quickly
+
+## Instructions
+
+When this skill is active, Claude will:
+
+1. Understand the full context of your feature engineer request
+2. Apply best practices and conventions for Data & Analytics
+3. Produce clean, well-structured, production-ready output
+4. Explain key decisions and offer alternatives where relevant
+
+## Examples
+
+### Example 1 — Basic Usage
+
+**User:** Help me get started with feature engineer.
+
+**Claude:** I'll walk you through the essential steps for feature engineer in your context...
+
+### Example 2 — Advanced Usage
+
+**User:** I need a production-ready feature engineer setup with full error handling.
+
+**Claude:** Here's a complete, production-hardened feature engineer implementation...
+
+## Guidelines
+
+- Always validate inputs before processing
+- Follow the conventions of the target platform or language
+- Prefer explicit over implicit — clarity beats cleverness
+- Include comments for non-obvious logic
+- Suggest tests or validation steps where appropriate
+
+## Dependencies
+
+Required: python, pandas, sklearn
+
+## Platforms
+
+Available on: claude-code, api
+
+---
+
+*Part of the [claude-skills](https://github.com/inbharatai/claude-skills) collection — 183+ skills for Claude.*