Add AGENTS.md

[valkirilov]

What

Introduce AGENTS.md as the entry point for AI coding agents, following the AGENTS.md standard.

This file serves as the primary starting point for AI agents, providing essential commands, testing instructions, code quality standards, and references to detailed guidelines.

Updated existing instruction files to point to AGENTS.md:

• .ai/README.md - Refocused as human-readable overview, now references AGENTS.md for AI agents
• .github/copilot-instructions.md - Updated to reference AGENTS.md as the entry point

This change improves discoverability and follows the emerging standard for AI agent documentation, making it easier for AI tools to find and use project-specific instructions.

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Note

Adds AGENTS.md as the entry point for AI agents and updates .ai/README.md and Copilot instructions to reference it, clarify structure, and list commands/workflows.

• Docs:
  • New: AGENTS.md with project overview, setup commands, testing, pre-commit checks, and boundaries for AI agents.
  • Updates:
    • .ai/README.md: Refocused as human-readable overview; adds structure diagram, AI tool symlink notes, and directs agents to AGENTS.md; tweaks MCP setup and update process.
    • .github/copilot-instructions.md: Points to AGENTS.md, clarifies rules structure, and lists commands including pr-plan.md, commit-message.md, and pull-request-review.md.

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