Add AI assistant instruction file (agents.md) for Copilot, Claude, and JetBrains Junie - #3176

Great!

I was just beginning to think we needed such files to avoid having to repeat to AI agents that we they need to update the api snapshot and use the new naming conventions for test methods.

@copilot please address all comments

@copilot Can't we just use a single Agents.md file instead?

@copilot Can't we just use a single Agents.md file instead?

Each tool reads from its own specific hardcoded path — Copilot reads .github/copilot-instructions.md, Claude reads CLAUDE.md, and Junie reads .junie/guidelines.md. None of them look for a generic Agents.md, so a single file wouldn't be picked up automatically by any of them.

If you'd like to reduce duplication, one option is to keep a canonical Agents.md with the shared content and have the three tool-specific files contain just a brief pointer to it. But all three files would still need to exist at their expected paths. Would you like me to go that route, or keep the three self-contained files as they are?

@copilot Merge the three files into a single agents.md in the root of the repo

@copilot Merge the three files into a single agents.md in the root of the repo

Done in 383a078. All the content is now in a single agents.md at the repo root. Each tool-specific file is a one-liner pointing to it:

• CLAUDE.md → @agents.md (Claude's native import syntax)
• .github/copilot-instructions.md → markdown link to agents.md
• .junie/guidelines.md → markdown link to agents.md