[clawosiris]

Summary

• run the report-severity functions against a live PostgreSQL fixture
• cover valid, absent, NULL, expired, and key-mismatched cache entries
• cover dynamic severity and overrides on/off, min-QoD filtering, NULL result types, and empty results
• verify all three split functions are installed as STABLE
• prove the dynamic branch is skipped on a cache hit and invoked on a cache miss

This is stacked on #3081. The temporary base branch mirrors its current head exactly so this PR contains only the coverage commit; it can be retargeted to main after #3081 merges.

@TheBeast85, this adds the database-backed regression coverage discussed in the review of #3081.

Validation

• focused PostgreSQL CTest passes against PostgreSQL 17
• full Debug build passes, including manage_pg.c
• CMake formatting and diff hygiene checks pass

Agent: GEA
Model: openai/gpt-5.6-sol
Thinking: xhigh
Bot-Owner: @llunved