Create agents.md file with comprehensive automation agent documentation

[Copilot]

This PR adds a comprehensive agents.md file at the repository root that documents all automation agents in the project, following the agents.md format specification.

What's Added

The new agents.md file includes:

• Top-level # Agents heading with dedicated ## Agents section
• Structured markdown table with columns: Name | Description | Inputs | Outputs | Permissions
• 14 documented agents covering all automation in the repository:
  • GitHub Actions workflows (testing, deployment, security scanning, code quality)
  • RAG evaluation tools (performance metrics, safety assessment, ground truth generation)
  • Infrastructure setup scripts (database initialization, Azure role configuration)
  • Development tools (load testing, pre-commit hooks, Azure Developer CLI)

Key Features

• Explicit inputs/outputs for each agent (e.g., "Push/PR events" → "Test results, coverage reports")
• Least-privilege permission scopes (e.g., contents: read, id-token: write)
• Linked workflows and scripts with relative paths for traceability
• Concise descriptions (1-2 sentences) explaining each agent's purpose

This documentation provides developers and operators with a clear understanding of all automated processes, their requirements, and capabilities within the RAG PostgreSQL OpenAI Python application.

Fixes #23.

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[Copilot]

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