Add AGENTS.md and testing style guide

Cameron Swordsrequested to merge
cam/add-agents-md into main

Changes

Adds documentation for AI agents and testing conventions:

  • AGENTS.md: Project overview, available make commands, directory structure, and contribution boundaries
  • docs/style/testing.md: Testing conventions covering testify usage, table-driven tests, builders, fakes, temp files, and async assertions

References

Add AGENTS.md and CLAUDE.md to support AI codin... (#420 - closed)

Edited by Cameron Swords

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