Release v2.0.0 - Spotify Feb 2026 API migration

[wardbox]

Context

Once all Spotify Feb 2026 API migration work is complete, cut a v2.0.0 release. This is a major version bump because several changes break backward compatibility.

Breaking changes to document

• Removed cmdlets: Get-NewReleases, Get-Category, Get-CategoryPlaylists, Get-ArtistTopTracks (Deprecate removed browse/discovery endpoints #74)
• Removed cmdlets or parameters: Get-UserProfile (no more arbitrary user lookup), Get-UserPlaylists, New-Playlist user param (Migrate user endpoints to /me equivalents #75)
• Batch fetch refactor: Get-Track, Get-Album, Get-Artist, Get-Episode, Get-Show — multi-ID batch behavior changes (Refactor batch fetch endpoints to individual calls #73)
• Library endpoint consolidation: potential parameter/behavior changes across Library/ and Follow/ cmdlets (Migrate library endpoints to /me/library #71)
• Parameter renames: e.g., Remove-PlaylistItems -Track → -Item (aliased for now) (Rename playlist /tracks endpoints to /items #72)
• Search limit max reduced from 50 to 10 (Update Search-Spotify limit constraints (max 50→10) #76)

Checklist

• All migration issues closed: Migrate library endpoints to /me/library #71, Rename playlist /tracks endpoints to /items #72, Refactor batch fetch endpoints to individual calls #73, Deprecate removed browse/discovery endpoints #74, Migrate user endpoints to /me equivalents #75, Update Search-Spotify limit constraints (max 50→10) #76
• Update module manifest version to 2.0.0
• Update CHANGELOG.md with breaking changes and migration guide
• Remove backward-compat aliases if desired (or keep and document)
• Tag and release

Tracks #70