docs(agents): note .gitlab-ci.yml is internal in root AGENTS.md

[mesutoezdil]

The GitLab CI for native subprojects section references .gitlab-ci.yml and tools/ci/generated-release-jobs.yml without noting they are internal config not present in this public snapshot, unlike tools/ci/subproject-validations.yaml which already got that note in #213. Added the same disclaimer here.

Refs: NO-REF

Summary by CodeRabbit

• Documentation
  • Clarified where native subproject CI jobs are defined.
  • Documented that certain CI configuration files are internal and excluded from public snapshots.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 2025827d-3bce-4391-a606-e632e8d66046

📥 Commits

Reviewing files that changed from the base of the PR and between adfbbd8 and 85fe1c4.

📒 Files selected for processing (1)

• AGENTS.md

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📝 Walkthrough

Walkthrough

Updated AGENTS.md to clarify that native subproject CI jobs are not declared in the umbrella pipeline and that related CI configuration files are internal and excluded from the public snapshot.

Changes

CI guidance clarification

Layer / File(s)	Summary
Native subproject CI documentation AGENTS.md	Clarifies native subproject job locations and identifies internal GitLab CI configuration files excluded from the public snapshot.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the documentation update clarifying that .gitlab-ci.yml is internal in the root AGENTS.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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_{Comment @coderabbitai help to get the list of available commands.}

[balajinvda]

lgtm