fix: optional genesis timestamp

[joe-p]

No description provided.

[Copilot]

Pull request overview

Updates the Algod Genesis schema to treat timestamp as an optional field across the generated Rust model and the OpenAPI v3 spec, and ensures the conversion pipeline consistently applies this rule when regenerating specs.

Changes:

• Make Genesis.timestamp optional in the Rust client model (and omit it from serialization when unset).
• Remove timestamp from the Genesis schema’s required list in algod.oas3.json.
• Add a conversion rule in convert-openapi.ts to keep Genesis.timestamp non-required during OAS2→OAS3 conversion.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
crates/algod_client/src/models/genesis.rs	Changes timestamp from u64 to Option<u64> and updates constructor initialization accordingly.
api/specs/algod.oas3.json	Removes timestamp from Genesis.required while retaining it as a schema property.
api/scripts/convert-openapi.ts	Adds a requiredFieldTransforms rule to force Genesis.timestamp to be optional in generated OAS3 output.

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