Adding agent files for oneDPL

[danhoeflinger]

I have been using these agent files for some time now locally.
The goal is to provide AI agents better context with which to navigate the repository intelligently.

We use AGENTS.md so that it is generic across all major providers, and symlinks (@) for CLAUDE.md and GEMINI.md. Gemini gets some extra guidance to resolve some recuring issues.
We keep AGENTS.md small so that we don't bloat or confuse the context too much.

We also provide and link to a more verbose description of the code layout in IMPLEMENTATION_DETAILS.md so it is only read into the context when needed.

I'm open to other configurations, perhaps refactoring IMPLEMENTATION_DETAILS.md into our main docs as a section and linking to it there, but I'd like to open it up for input from others.

[Copilot]

Pull request overview

Adds repository “agent guidance” documentation intended to help AI assistants navigate and work in the oneDPL codebase more effectively, with a concise entrypoint (AGENTS.md) and a more detailed architecture reference (IMPLEMENTATION_DETAILS.md), plus provider-specific entry files.

Changes:

• Added AGENTS.md with build/test, architecture, and contribution pointers for AI agents.
• Added IMPLEMENTATION_DETAILS.md describing oneDPL’s layering, backend structure, and test layout.
• Added CLAUDE.md and GEMINI.md as thin entry files referencing AGENTS.md (with extra Gemini-specific guidance).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
AGENTS.md	New agent-facing quick reference for building/testing, architecture, and repo conventions
IMPLEMENTATION_DETAILS.md	New detailed architecture/development-pattern overview for deeper context
CLAUDE.md	Provider-specific entry file referencing AGENTS.md
GEMINI.md	Provider-specific entry file referencing AGENTS.md, with additional workflow guidance

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

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[mmichel11]

Do we want a requirement specifying that all AI-authored commits should be disclosed in the commit message? I think if we list it here, the agent should respect it.

It brings up another question about if we should adjust the contribution guide to give user guidance for AI generated code (e.g. all commit should be human reviewed prior to opening a PR, but I think that can be addressed separately).

[danhoeflinger]

Its a good question. I think ultimately the committing user has to be responsible for the code whether or not it was partially or fully generated by an agent. In this case, I'm not so sure that adding something to the commit message is important, but its worth discussing and perhaps making a policy.