feat(koios): replace Schema.Object with typed Schema.Struct for voting_procedures and proposal_procedures

[Mechack08]

Summary

The voting_procedures and proposal_procedures fields in TxInfoSchema had two //TODO: add Schema.Struct comments, leaving them as unvalidated Schema.Array(Schema.Object) and Schema.Object. This PR replaces both with proper typed Schema.Struct definitions, improving runtime safety when parsing Koios /tx_info responses.

Changes

packages/evolution/src/sdk/provider/internal/Koios.ts

• voting_procedures: Changed from Schema.Array(Schema.Object) to a typed Schema.NullOr(Schema.Array(Schema.Struct(...))) with:

  • voter_role: Schema.Literal("ConstitutionalCommittee", "DRep", "SPO")
  • vote: Schema.Literal("Yes", "No", "Abstain")
  • All remaining fields typed as Schema.String / Schema.Number

• proposal_procedures: Changed from Schema.Object to a typed Schema.NullOr(Schema.Array(Schema.Struct(...))) with:

  • type: Schema.Literal("ParameterChange", "HardForkInitiation", "TreasuryWithdrawals", "NoConfidence", "NewCommittee", "NewConstitution", "InfoAction")
  • withdrawal: nested Schema.NullOr(Schema.Array(Schema.Struct(...)))
  • param_proposal: Schema.NullOr(Schema.Object) (intentionally loose — shape varies per proposal type)

Both fields are now NullOr arrays, matching the Koios OpenAPI spec (anyOf: [array, null]).

Schema source: https://preprod.koios.rest/#post-/tx_info

packages/evolution/test/Koios.schema.test.ts (new file)

Added 12 tests covering:

• Valid and null inputs for both fields
• All valid literal union values (voter_role, vote, proposal type)
• Rejection of unknown/invalid enum values
• Rejection of missing required fields

Test Results

Related

Resolves the two //TODO: add Schema.Struct comments in TxInfoSchema.