[Chore][Docs] Add AGENT.md

[ruanwenjun]

Was this PR generated or assisted by AI?

YES. The AGENT.md content was generated with AI assistance based on the existing CLAUDE.md. The local-only AGENT.local.md conversion was also prepared with AI assistance but is intentionally ignored and not committed.

Purpose of the pull request

This pull request adds an agent-facing project index for Apache DolphinScheduler by adapting the existing CLAUDE.md guidance into AGENT.md. It also ignores AGENT.local.md so local-only agent overrides can be kept out of commits, matching the existing CLAUDE.local.md behavior.

Brief change log

• Add root AGENT.md with project-wide build, test, service, module, and contribution guidance.
• Add AGENT.local.md to .gitignore for local-only agent overrides.

Verify this pull request

This pull request only changes agent-facing documentation and ignore rules without runtime test coverage.

Verified locally with:

• git diff --check HEAD~1..HEAD

Pull Request Notice

Pull Request Notice

This pull request does not contain incompatible changes.

[SbloodyS]

LGTM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud