- parse source_counts into HybridRAGResponse and additively parse the
shared-contract source_status/degraded fields when present (absence
tolerated, so deploy order between tatlock and library-desk never
matters)
- hybrid_search appends a one-line coverage note when a leg reported
'failed' (or degraded is set), falling back to inferring silent legs
from source_counts on older library-desk versions
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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