Add copilot-instructions.md for AI agent onboarding

[Copilot]

Create comprehensive AI agent guidance document covering architecture, patterns, and conventions for the IACT project codebase.

Changes

• Created .github/copilot-instructions.md (229 lines)
  • Architecture overview: Current minimal state + architectural vision (modularity, extensibility, automation-first, documentation-driven)
  • Project structure: Current layout and expected future directories (src, tests, docs, scripts, config, examples)
  • Development patterns: Code organization, naming conventions, git workflow, testing philosophy
  • AI-specific guidance: Codebase exploration, minimal changes approach, problem-solving methodology, common pitfalls, security considerations
  • Operational details: Quick reference commands, resource links, maintenance guidelines

Structure

.github/
└── copilot-instructions.md
    ├── Repository Overview
    ├── Big Picture Architecture (current + vision)
    ├── Project Structure (current + future)
    ├── Development Guidelines
    ├── Key Patterns and Conventions
    ├── AI Agent Best Practices
    ├── Technology Stack
    ├── Communication and Collaboration
    └── Quick Reference

Document designed to evolve with the project as a living guide.

Original prompt

Analyze this codebase to generate or update .github/copilot-instructions.md for guiding AI coding agents.Focus on discovering the essential knowledge that would help an AI agents be immediately productive in this codebase. Consider aspects like:

• The "big picture" architecture that requires reading multiple files to understand - major components, service boundaries, data flows, and the "why" behind structural decisions

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