OpenAPI Spec contains validation errors

The current OpenAPI specification is not valid and cannot be used in tools like Swagger Editor or code generators.

Steps to Reproduce
1. Open Swagger Editor.
2. Paste the contents of the OpenAPI spec file.
3. Observe the validation errors.

Observed Errors

Swagger Editor reports multiple structural issues:

Errors
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Structural error at components.parameters.comment_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.follower_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.following_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.playlist_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.fake_playlist_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.repost_playlist_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.track_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.test_track_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.user_id
should have required property 'required' missingProperty: required
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Structural error at components.parameters.user_id_to_follow
should have required property 'required' missingProperty: required
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The Apple OpenAPI code generator for Swift also fails with similar issues:

- Additional file comments: <none>/Users/obrhoff/Downloads/new_music_app/soundcloud-open-api-schema.yaml: error: Inconsistency encountered when parsing `comment_id` in Document.components.parameters: positional path parameters must be explicitly set to required.
Error: /Users/obrhoff/Downloads/new_music_app/soundcloud-open-api-schema.yaml: error: Inconsistency encountered when parsing `comment_id` in Document.components.parameters: positional path parameters must be explicitly set to required.
[generate] ERROR task failed

Locate the OpenAPI spec file referenced in the issue and paste it into Swagger Editor to reproduce the listed structural errors. Update the named component parameters so the specification validates, then confirm the Apple OpenAPI Swift generator no longer reports the positional path parameter error.