test: fix Prisma mock drift for pulse-league + article + tracks

[Tatenda]

Summary

Fixes 26 failing tests caused by Prisma mock drift after recent service refactors. Scope is limited to test files only — no schema, migration, jest.setup.js, or src/lib/mcp/* changes.

• pulse-league-service.test.ts (25 cases): getLatestEligibilityScores was refactored from groupBy + N×findFirst into a single $queryRaw (DISTINCT ON) for perf. Tests still mocked the old shape, so every case threw _db.prisma.$queryRaw is not a function. Added $queryRaw to the prisma mock plus a mockEligibilityScores(scores) helper that seeds the raw rows directly, and replaced all the old groupBy/findFirst setup blocks with calls to it.
• article-service.test.ts (1 case): getArticleBySlug now reads from prisma.contentLink to resolve linked tool slugs. The mock didn't include contentLink, so the slug-lookup case threw Cannot read properties of undefined (reading findMany). Added contentLink.findMany (resolves to []) to the mock.
• tracks/route.test.ts: investigated — already passing as-is. No change needed.

All 82 tests across the three suites pass locally. tsc --noEmit is clean for these files (the only error is a pre-existing missing docs-index.generated.json in src/lib/mcp/, which is in active PR review on #48 and outside scope).

Test plan

• yarn test src/lib/services/__tests__/pulse-league-service.test.ts --ci — 34/34 pass
• yarn test src/lib/services/__tests__/article-service.test.ts --ci — 45/45 pass
• yarn test src/app/api/tracks/__tests__/route.test.ts --ci — 3/3 pass
• CI confirms no regressions in other suites

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
music-next	Building	Preview, Comment	May 26, 2026 7:27pm

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