feat(java): forward-compatible unions; feat(typescript): zod v4-mini support (#1700)

## Java
- Make untagged unions forward compatible with unknown variants using
JsonNode fallback
[#3399](speakeasy-api/openapi-generation#3399)
- Ensure tagged unions are forward compatible with unknown discriminator
values using custom type resolvers
[#3367](speakeasy-api/openapi-generation#3367)

## TypeScript
- Add Zod v4-mini support for smaller bundle sizes and modern Zod
[#3361](speakeasy-api/openapi-generation#3361)

Author: mfbx9da4

go.mod

@@ -5,6 +5,7 @@ go 1.25.0
 replace github.com/pb33f/doctor => github.com/speakeasy-api/doctor v0.20.0-fixvacuum
 
 replace github.com/pb33f/libopenapi => github.com/speakeasy-api/libopenapi v0.21.9-fixhiddencomps-fixed
+
 require (
 	github.com/AlekSi/pointer v1.2.0
 	github.com/KimMachineGun/automemlimit v0.7.1
@@ -38,7 +39,7 @@ require (
 	github.com/speakeasy-api/huh v1.1.2
 	github.com/speakeasy-api/jq v0.1.0
 	github.com/speakeasy-api/openapi v1.11.0
-	github.com/speakeasy-api/openapi-generation/v2 v2.745.2
+	github.com/speakeasy-api/openapi-generation/v2 v2.748.0
 	github.com/speakeasy-api/openapi-overlay v0.10.3
 	github.com/speakeasy-api/sdk-gen-config v1.42.0
 	github.com/speakeasy-api/speakeasy-client-sdk-go/v3 v3.26.7

go.sum

@@ -553,8 +553,8 @@ github.com/speakeasy-api/libopenapi v0.21.9-fixhiddencomps-fixed h1:PL/kpBY5vkBm
 github.com/speakeasy-api/libopenapi v0.21.9-fixhiddencomps-fixed/go.mod h1:Gc8oQkjr2InxwumK0zOBtKN9gIlv9L2VmSVIUk2YxcU=
 github.com/speakeasy-api/openapi v1.11.0 h1:Hzr1zuXDtdJa+YLGw8ZMM6i19V4T3V5L8T5K8JUZ8gg=
 github.com/speakeasy-api/openapi v1.11.0/go.mod h1:JnmVyPKhAhwTup7/jKYpnv2B0O2Lm3C+cjpVZKieVvk=
-github.com/speakeasy-api/openapi-generation/v2 v2.745.2 h1:sxnS6HVpaT19UTzBphO322UhbCB/FjtKi3+Uy8Q6Iso=
-github.com/speakeasy-api/openapi-generation/v2 v2.745.2/go.mod h1:BFcupAsPG9V10q1DGDI+Uslajq2WcYtRFn4IP4vFYSk=
+github.com/speakeasy-api/openapi-generation/v2 v2.748.0 h1:t0gYy0Vt/QfNoAFem8wHYS0HpnRx4rvZ91rzFHg6aEE=
+github.com/speakeasy-api/openapi-generation/v2 v2.748.0/go.mod h1:BFcupAsPG9V10q1DGDI+Uslajq2WcYtRFn4IP4vFYSk=
 github.com/speakeasy-api/openapi-overlay v0.10.3 h1:70een4vwHyslIp796vM+ox6VISClhtXsCjrQNhxwvWs=
 github.com/speakeasy-api/openapi-overlay v0.10.3/go.mod h1:RJjV0jbUHqXLS0/Mxv5XE7LAnJHqHw+01RDdpoGqiyY=
 github.com/speakeasy-api/sdk-gen-config v1.42.0 h1:L8S8wNQvJP/VlQH4sboC32JNx5uiZ8yQ1WdJCBOi9Yg=