[modosc]

first 3.2 pr, part of #210.

• parses $self as self_uri
• SelfBefore32 flags $self in pre-3.2 docs
• $self isn't used as the base uri for $ref resolution yet
• adds the spec/data/openapi_3_2 fixture dir and integration_3_2_spec.rb, which the rest of the 3.2 prs build on

[takayamaki]

Sorry for the late review.
I read through this and it looks good to me.

• The parse layer and the rule follow the same pattern as the 3.1 root-level fields (jsonSchemaDialect, webhooks).
• SelfBefore32 is a good name, because both 3.0 and 3.1 lack this field.
• $self is not used for $ref resolution yet.
  I think this is acceptable for now, like $dynamicRef, which is also parsed but not resolved.
  The CHANGELOG says this clearly.
• Ruby 4.0 is not in the CI matrix, so I ran the tests locally on Ruby 4.0.5.
  They pass.

[geemus]

@modosc thanks for working on this, and apologies also for my delays (the last couple weeks were surprisingly hectic).

[geemus]

lgtm, thanks!