feat(taste): household co-play similarity — #1533

Milestone #160 Opt 5. A collaborative candidate arm: tracks by artists
co-played across the instance with the seed's artist.

Minstrel is a single shared-library, multi-user server (no per-user
library ACL — verified: no owner/share/group model), so the "household"
is the whole instance's user set; the rule #47 scoping is satisfied by
the shared-library boundary. Single-user servers produce no edges.

- No migration: source='user_cooccurrence' was pre-whitelisted in the
  0009 similarity CHECK from day one.
- internal/db/queries/coplay.sql: Delete + Insert artist co-play edges.
  Score = Jaccard of the two artists' distinct-player sets (controls for
  globally-popular artists); >= 2 co-players AND Jaccard >= floor kept
  (the floor also self-limits hub artists). Completed plays, 365d window.
- internal/coplay: periodic worker (6h) that atomic-replaces the
  user_cooccurrence edge set from play_events — pure local SQL, no
  external calls. Wired in main.go alongside the similarity worker.
- LoadRadioCandidatesV2: new coplay_artists arm (source='user_cooccurrence',
  seed-artist based, 0.5 damp like similar_artists) + $11 limit;
  CandidateSourceLimits.UserCoplay (default 20, For-You 40).
- Integration tests: perfect-overlap Jaccard=1.0 edge + single-user
  empty-set gate.

Device axis and AcousticBrainz (Opt 4) are separately tracked; this
closes the milestone-#160 sequential options.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/recommendation/candidates.go

@@ -82,6 +82,10 @@ type CandidateSourceLimits struct {
 	// weighted taste-profile artists. 0 disables the arm (e.g. cold-start
 	// users have an empty profile, so it contributes nothing anyway).
 	TasteOverlap int
+	// UserCoplay (#1533): tracks by artists co-played across the instance
+	// with the seed's artist (source='user_cooccurrence'). Empty on
+	// single-user servers, so it contributes nothing there.
+	UserCoplay int
 }
 
 // DefaultCandidateSourceLimits returns the v1 hardcoded constants per spec.
@@ -93,6 +97,7 @@ func DefaultCandidateSourceLimits() CandidateSourceLimits {
 		LikesOverlap:  20,
 		RandomFill:    30,
 		TasteOverlap:  20,
+		UserCoplay:    20,
 	}
 }
 
@@ -125,6 +130,7 @@ func LoadCandidatesFromSimilarity(
 		Limit_4: int32(limits.LikesOverlap),
 		Limit_5: int32(limits.RandomFill),
 		Limit_6: int32(limits.TasteOverlap),
+		Limit_7: int32(limits.UserCoplay),
 	})
 	if err != nil {
 		return nil, err