chore(docs): add AGENTS.md repo guidelines

[strantalis]

Proposed Changes

• Add AGENTS.md with repo structure and build/lint/test guidance.

Checklist

• I have added or updated unit tests
• I have added or updated integration tests (if appropriate)
• I have added or updated documentation

Testing Instructions

• make toolcheck (pass)
• make lint (fails: existing golangci-lint findings)
• make test (fails: oauth tests require Docker/testcontainers)

[gemini-code-assist]

Summary of Changes

Hello @strantalis, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new AGENTS.md documentation file to establish clear and comprehensive repository guidelines. The primary goal is to streamline the development process, improve consistency across contributions, and provide a single source of truth for project structure, development commands, coding standards, and contribution practices, thereby enhancing developer onboarding and collaboration.

Highlights

• New Repository Guidelines Document: A new file, AGENTS.md, has been added to the repository. This document serves as a central guide for contributors, outlining various aspects of development within the project.
• Comprehensive Development Guidance: The AGENTS.md file covers essential topics including project structure and module organization, standard build, test, and development commands (using make targets), coding style and naming conventions, detailed testing guidelines (unit, BDD, integration), commit and pull request best practices, and security/configuration tips.
• Standardized Workflow: The new guidelines aim to standardize the development workflow by providing clear instructions on tooling verification (make toolcheck), building (make build), linting (make lint), testing (make test), and local infrastructure setup (docker compose up).

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A guide, so clear and bright, For code to shine, day and night. Rules to follow, true, For all developers, old and new.

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[gemini-code-assist]

Code Review

The new AGENTS.md file provides a comprehensive overview of the repository's structure, development commands, and guidelines. It's a valuable addition to the documentation, enhancing clarity for contributors.

[marythought]

This looks like a great start!