Add support for AGENTS.md

[kowyo]

Summary

Add support for AGENTS.md files to provide project-specific context and instructions to the AI agent.

Motivation

AGENTS.md is an emerging standard that helps AI coding agents understand and work effectively with a project codebase. Similar to how README.md serves developers, AGENTS.md provides:

• Clear context about the project purpose and architecture
• Precise instructions for build processes, testing, and code conventions
• Project-specific rules and guidelines for code generation
• Security considerations and sensitive information handling

This will reduce back-and-forth clarification rounds, ensure consistent output following project conventions, save token usage, and help new contributors onboard faster.

Proposed Solution

• Detect and parse AGENTS.md files in project root or CONFIG_DIR
• Include AGENTS.md content as context in agent conversations

Acceptance Criteria

• AGENTS.md file detection implemented
• Content is properly included in agent context
• Support for both root-level and CONFIG_DIR/AGENTS.md

Additional Context

References:

• https://ainativecompass.substack.com/p/good-practices-creating-agentsmd
• https://www.aihero.dev/a-complete-guide-to-agents-md
• https://plgah.medium.com/one-agents-md-to-rule-them-all-70e6dc87a05f