test: dedup guard verification

[CristianAmbrosini]

Test PR to verify cross-container dedup guard on dev18. Will be closed after testing.

[sonar-review-dev18]

Summary

This PR adds a README.md file with a timestamped test message to verify the cross-container dedup guard on dev18. The change is minimal and deliberately temporary—the PR will be closed after testing is complete.

The timestamp in the message (1778233206) is used to create unique test artifacts for dedup verification.

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What reviewers should know

What to review:

• This is infrastructure testing only; no production code changes
• The single file addition is intentional and temporary
• No need to scrutinize code quality, logic, or long-term maintainability

Context for reviewers:
The "dedup guard" likely prevents duplicate work across containers during builds or deployments. This PR is a minimal test case to verify that guard is functioning correctly. Once testing is complete and dedup behavior is confirmed, this PR will be closed and the changes discarded.

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[sonar-review-dev18]

LGTM! ✅

Clean, minimal change — just a single-line README addition for infrastructure testing. No logic, no bugs, no security concerns, and nothing that conflicts with the sonar exception-handling guideline.

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