Add RecordProperty test traceability: score/time_slave unit tests

[lavrovvalera]

Important

Link the implementing PR to this issue by including Closes #92 in the PR description or commit message.

What

Add RecordProperty traceability metadata to all unit tests in score/time_slave/ so each test is linked to the requirement it verifies.

Each test fixture must carry in SetUp():

• RecordProperty("TestType", "requirements-based")
• RecordProperty("DerivationTechnique", "requirements-analysis")

Each individual test must carry:

• RecordProperty("Description", "Given ... When ... Then ...")
• RecordProperty("FullyVerifies", "comp_req__time_slave__<keyword>") or RecordProperty("PartiallyVerifies", "comp_req__time_slave__<keyword>")

Acceptance Criteria

• All cc_test targets under //score/time_slave/... carry the four required properties
• comp_req UIDs referenced are valid comp_req__time_slave__* identifiers
• bazel run //:docs shows no broken traceability links for score/time_slave

References

• S-CORE Verification