UUID v6 utility support added

Patch Changes

• #10906 f61b345 Thanks @hntrl! - feat(core): add uuid v6 utility support

  Add v6 UUID generation support to @langchain/core/utils/uuid by vendoring the upstream uuidjs v6 implementation and its v1ToV6 helper, exporting v6 from the UUID utils index, and adding tests for deterministic generation, buffer/offset behavior, validation/versioning, and ordering.

• #10872 a640079 Thanks @hntrl! - chore(deps): remove redundant @types/uuid declarations

  Remove @types/uuid from package manifests that rely on @langchain/core/utils/uuid or do not require uuid type stubs directly, and refresh the lockfile entries accordingly.

• #10792 3682268 Thanks @Genmin! - fix(core): apply v1 message casting after implicit streaming aggregation

• #10901 f26fc4a Thanks @christian-bromann! - fix(testing): share fakeModel invocation state across bindTools instances