[madeofpendletonwool]

Moves search suggestions (ADR 0010, "your vibe" / "group vibe") onto the DJ (ADR 0012), so they get the same profile, candidates and scoring as autopilot. Phase 7, stage 3.

What changed

• suggest.Service.Graph: when it's set (in main.go, whenever the graph has sources), suggestions ask dj.Engine.Choose first.
  • Mine narrows the taste to the asker's own (dj.Request.Member). Group uses the room's, with members' tastes mixed as they are for autopilot.
  • source=queue reads the taste from the songs playing and waiting (dj.Request.Queued). When nothing is queued, the songs that played through stand in.
  • What the room heard, skipped and doubts stays room-wide in both narrowed tastes.
  • Picks are matched only on the asker's links that can search, so every suggestion can still be queued by the asker. because is the member's song by the artist the pick leads from. A pick that only autopilot's songs led to has no seed, so it's left out.
  • The DJ is asked at explore 25 (near the vibe), the same as before, when suggestions always used "similar".
• dj.Choose for longer lists: n picks draw 2n candidates from a shortlist of at least 2n songs, with at most 2 per artist. Up to 6 candidates are looked up on services at once, in draw order. Autopilot asks for 2 picks, so it tries exactly the same candidates as before. Opening sessions is serialized, because the Finder isn't safe for concurrent use.
• Fallback: with no graph, or a graph that knows nothing near the vibe, suggestions use the services' own recommendations as before.
• Removed duplicated Finder paths:
  • Finder.Like replaces the recommend-or-search branch that suggestions and GetQueueItemSimilar each had.
  • suggest.TrackOf is gone; callers use dj.TrackOf.
  • suggest.ArtistKey now compares names with dj.ArtistKey.
  • Autopilot's own fallback (like/choosePick, with its discovery rules) is unchanged.

Tests

• internal/suggest/dj_test.go covers, with an in-memory graph:
  • "your vibe" leaves out the other member's artists and uses only the asker's links;
  • "group vibe" credits each member's song;
  • the queue vibe;
  • artists the room turned away;
  • falling back when the graph knows nothing;
  • search-only services.
• TestProfileNarrow covers the member and queued tastes keeping the room's skips and heard songs.
• The existing suggestion tests are unchanged and still pass, because they run without a graph.
• go test -race ./... passes and golangci-lint run ./... reports 0 issues.

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