feat(parser): detect discriminated unions through allOf-wrapped variants

[gjtorikian]

Summary

Discriminator detection on allOf [base, oneOf […]] schemas only worked when each oneOf variant exposed its const property directly. When a variant was itself wrapped in allOf — e.g. ConnectApplication's OAuth branch, which merges OAuth-specific fields with a nested oneOf for first-party / dynamically-registered sub-variants — the detector silently fell back to flattening, and the flatten path skipped any variant without top-level properties. The result: emitters consuming Model.discriminator (Python's dispatcher) lost the OAuth variant entirely, and the parent model carried only application_type: literal 'm2m'.

This walks allOf wrappers in the four places that gated this:

• detectAllOfVariantDiscriminator finds the shared const property through allOf on each variant.
• deriveDiscriminatedVariantName reads the const value through allOf and qualifies single-word consts (oauth, m2m) with the parent name so they don't collide globally. Multi-word EventSchema variant names (ActionAuthenticationDenied, …) keep their form.
• extractDiscriminatedAllOfVariantModels flattens variant allOf bodies and merges nested oneOf into a single shape (literal conflicts widen — is_first_party: true | false → boolean), then merges the outer base object's fields into every variant so each emitted variant is self-contained.
• collectReferencedNames chases Model.discriminator.mapping when seeding reachability so the variant models survive — previously isDiscriminatedModel only matched event/type/object-style literal fields, missing application_type.

Separately, applies schemaNameTransform to synthetic enums built in schemaToTypeRef and buildSyntheticEnumRef. The hook was only wired into component-schema names, so a project-level rename map in oagen.config.ts (e.g. RadarAction: 'RadarListAction' for the inline /radar/lists/{type}/{action} path-param enum) couldn't reach inline parameter or field enums. Now it can.

Test plan

• npm run typecheck clean
• npm test — 1423/1423 passing
• Regenerated workos-{node,python,go,kotlin,dotnet,ruby,php,rust} against this branch + the paired oagen-emitters PR; verified ConnectApplication output across every SDK (see commit body for shapes)
• workos-go go build ./... clean
• workos-rust cargo check clean (only pre-existing unrelated warning)
• workos-node npm run typecheck shows only pre-existing hand-owned errors (radar wiring, organization-membership, lastUsedAt test fixture)
• Paired oagen-emitters PR: workos/oagen-emitters#TBD

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