chore: refine OSS helper rules and point CLAUDE.md to them

[orpiske]

Summary

Claude Code on behalf of Otavio Rodolfo Piske

Follow-up to #24251 — addresses review feedback from @davsclaus and reduces overlap between CLAUDE.md and .oss-ai-helper-rules/.

• Revert build command to mvn verify (the -Dquickly variant skips tests, which is wrong for the default build command)
• Add missing Records code style rule: "Records are allowed for internal/non-API classes; do NOT convert existing public API classes to Records"
• Add a pointer in AGENTS.md (the file behind the CLAUDE.md symlink) directing agents to .oss-ai-helper-rules/project-standards.md for build commands and code style restrictions

This establishes .oss-ai-helper-rules/ as the source of truth for build commands and standards, reducing the risk of the two files drifting apart.

Test plan

• Verify build command is mvn verify in project-standards.md
• Verify Records rule is present in code style restrictions
• Verify AGENTS.md points to .oss-ai-helper-rules/project-standards.md

[davsclaus]

Do we have something about that any kind of coding assistance MUST be co signed in the commit message.

Co-authored by a coding agent, or whatever they do.

We need this from ASF to track what is AI assisted vs what is not.

Here is an example that is good

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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[orpiske]

@davsclaus I think this is a configuration on the coding agent itself. I know Claude allows you to set a configuration like this in the settings file:

"attribution": {
    "commit": "... something something",
    "pr": "... something something"
  },

[github-actions]

ℹ️ CI did not run targeted module tests.

---

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[davsclaus]

okay but if we add to the rules/skills files that the commit message must contain a "co-authored by AI" or similar to signal its AI assisted.

[davsclaus]

We are back to this, this is just too slow. And you have test command further below that does the same

[oscerd]

in the harness organization, I think we should remove the project when we merge the rules in the upstream.