chore: promote release hardening from develop to Q.A

[v-Kaefer]

Linked Issue

• Closes Harden promotion gates and embedded repository detection #16

Milestone

• Release hardening / maintenance

Summary

• Promote the hardening fixes already merged into develop through the required develop -> Q.A stage.
• Includes trusted metadata-only promotion gates, explicit source-repository detection, embedded-target validation fixes, and regression coverage from PR fix: harden promotion gates and embedded repository validation #17.

How to test

• Test type: automated / Q.A
• Steps: run repository-quality checks and the Q.A compatibility/validation suite for this promotion; verify the source-branch gate accepts only develop -> Q.A.

Evidence

• Fixes were reviewed and merged into develop through PR fix: harden promotion gates and embedded repository validation #17
• Regression tests were added for repository-mode detection and preserved target Makefiles
• Q.A validation checks complete successfully for this promotion

Known risks

• Metadata-only gates use pull_request_target intentionally and must remain free of pull-request code execution.
• .project-setup-source must remain source-only and must not be distributed into embedded targets.

DoD checklist

• Scope implemented as defined
• Tests added and documented in the originating fix
• Q.A promotion checks completed successfully
• No known critical breakage introduced

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