Function releaseStaleMainSlot

releaseStaleMainSlot(
    accessToken: string,
    account: ConnectedAccount,
    livestream: Livestream,
    now: Date,
): Promise<ReleaseStaleMainSlotResult>
Moves a never-live main-slot broadcast off the main key: rebinds YouTube to temp, marks the row ended, and records Livestream.keySlotStaleAt.
Parameters
- accessToken: string
  OAuth access token with YouTube live scopes.
- account: ConnectedAccount
  Connected YouTube account with decrypted stream keys.
- livestream: Livestream
  Stale main-slot livestream to release.
- now: Date
  Timestamp stored on the row.
Returns Promise<ReleaseStaleMainSlotResult>
Updated livestream row or upstream error details.
- Defined in lib/livestreams/stale-main-slot.ts:124