fix(provider): accept Ogmios variants in Kupmios protocol parameters

[Kshot3000]

Fixes two getProtocolParameters decoding failures in the Kupmios provider, both reproduced first as failing tests against the preprod protocol-parameters fixture.

#568 — a missing cost model language fails the call. Ogmios builds plutusCostModels from costModelsValid, so it sends only the languages that have a cost model, and its JSON schema for the map has no required keys. The schema here required plutus:v1, plutus:v2 and plutus:v3, so a network without one of the three failed to decode. Each language key is now optional, and toProtocolParameters maps a missing language to an empty cost model ({}), as the issue suggests.

#559 — Ogmios v7 renamed maxReferenceScriptsSize. Ogmios v7 calls it maxReferenceScriptsSizePerTransaction and adds maxReferenceScriptsSizePerBlock; the schema required the old key, so the call failed against a v7 server. That value is not mapped into the provider's ProtocolParameters, so all three spellings are now optional and either server generation decodes.

Tests (three new cases in test/provider/Kupmios.test.ts, in the file's stub-fetch style, each verified red — a ProviderError from getProtocolParameters — before the fix):

• the fixture with plutus:v1 removed decodes, with costModels.PlutusV1 equal to {} and the V2/V3 models intact;
• the fixture with plutusCostModels: {} decodes to three empty cost models;
• the fixture with the v7 keys (maxReferenceScriptsSizePerTransaction + maxReferenceScriptsSizePerBlock, old key absent) decodes.

Results: Kupmios test file 19/19; full package suite 1681 passed / 75 skipped / 0 failed; tsc --noEmit and the package build are clean. A patch changeset is included.

One scope note: #568 also mentions the Ogmios v7 guard redeemer purpose. I left that out — the issue itself says it belongs with Dijkstra support, and no current network sends it.

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Independent builder — not affiliated with IntersectMBO, the Cardano Foundation or IOG.

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