retrieval_eval.py now runs every existing query through hybrid_query
alongside flat/cascade, and gate criteria 1/3 (no degradation, negative
controls) check hybrid too -- this is the phase's key regression test: does
adding mail chunks to the HNSW index degrade the 7 existing paperless
queries? Criterion 4 (mail hit@3 in hybrid) is wired but skipped with an
explicit report note when queries.yaml's new `mail_queries` placeholder is
empty, rather than silently PASSing/FAILing on absent data.
queries.yaml: added an empty `mail_queries: []` placeholder + inline format
docs. The existing 7-query `queries:` list is untouched.
REMINDER for the operator (per plan §8, Krok 5): 3-5 mail queries are still
needed -- things you know are in last year's mail, plus each one's expected
gmail Message-ID -- before criterion 4 and the full plan §8 gate can PASS.
Until then this only re-verifies the paperless regression check.
docs/kb/modules/05-faza-mailowa-plan.md, §8.
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