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Advisor Pipeline Evidence
Advisor candidates are explicitly typed as embedding_deployment or retrieval_pipeline.
Embedding candidates reference completed evaluation runs; pipeline candidates reference immutable
pipeline identities whose latest completed fixed-pool runs provide control/candidate metrics.
Hard gates remain deterministic: incomplete/non-comparable evidence, critical regression, security or license block, runtime/GPU-fit failure, unsupported migration and latency policy override aggregate gains. Unknown evidence stays unknown.
Pipeline recommendations may return
KEEP_CURRENT_EMBEDDING_ADD_RERANKER_CANDIDATE, but M8's two real reranking runs returned
KEEP_CURRENT. The evaluated E5 embedding also returned KEEP_CURRENT: its aggregate retrieval
metrics improved, but three critical regressions, unapproved license state, a required reindex and
the p95 latency policy block promotion. Recommendations never promote or cut over automatically.