bvandeusenandClaude Opus 5
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Operator, 2026-09-10: "it should also be able to include music from the same artist." Completes #3881 — the weights and pool landed in f367eeaa; this is the eligibility half. produceSeedMixes filtered the seed artist out entirely: // "Songs like X" excludes X's own songs. if !pgtypeUUIDEqual(c.Track.ArtistID, artistID) { ... } That reads as obviously right and is not. The seed is a TRACK — the artist's top-played one — and the tracks most likely to sound like it are usually the rest of that artist's catalogue. The filter threw away the seed's nearest neighbours, then reached FURTHER OUT to replace them. On the one surface whose job is staying in a neighbourhood, that is backwards, and it worked against the coherence tuning rather than with it. Domination is bounded by the cap instead of by exclusion, which is the distinction that makes this safe rather than a new problem: capCandidatesByAlbumAndArtist already allows at most 3 tracks per artist in a 25-track mix, so the seed artist gets 12% at most — a presence, not a takeover. Without that bound this would just be the radio failure (#3882) arriving on a different surface. The seed track itself still cannot appear; it is passed to LoadCandidatesFromSimilarity as an exclusion. Guarded end-to-end rather than by reading the source, for two reasons: the check has to survive the filter returning in a different shape, and an absence check would now match the comment that explains why the filter is gone — rule 167's prose trap exactly. The test asserts both directions, that at least one mix contains its seed artist and that none exceeds the cap. Its falsification is by construction rather than by execution: under the previous code every mix's own-artist count was necessarily zero, so the assertion could not have passed. Running it needs Postgres, which is the integration lane's job. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SQ31KQpYbStyK5y58UmPLH