OpenAPI type generation pipeline

[guidefari]

Summary

Set up automated type generation from Spotify's OpenAPI spec instead of hand-maintaining types.

Context

PRD implementation decisions: "Generated Spotify OpenAPI types will be the canonical contract source" and "Generated artifacts and handwritten modules will be kept clearly separated."

Current state: all types in model/SpotifyObjects.ts and model/SpotifyObjectSchemas.ts are hand-written. This works but creates drift risk as Spotify's API evolves.

Acceptance criteria

• Script or tooling to generate TypeScript types from Spotify OpenAPI spec
• Clear separation between generated and handwritten code
• Regeneration doesn't destroy Effect-specific schemas or facades

Related

PRD #9 — user stories 14, 15, 37

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Migrated from guidefari/spotify-effect#44