fix(sdk): expose clients' additional-types through @epilot/sdk

[josecarneiro]

Summary

@epilot/sdk/{api} only ever re-exported the types generated from an API's OpenAPI specification. Types a client declares by hand in clients/{api}-client/src/additional-types.ts were silently dropped, even though @epilot/{api}-client exports them from its package root.

That is why epilot-dev/pricing#292 had to re-declare PriceTierEnhanced locally when it migrated from @epilot/pricing-client to @epilot/sdk/pricing — the type exists in clients/pricing-client/src/additional-types.ts, but nothing carried it into the SDK.

Root cause is scripts/generate-sdk-v2.ts: copyTypes() copies only src/openapi.d.ts into packages/epilot-sdk-v2/src/types/, and the generated src/apis/{api}.ts re-exports just ../types/{api}.

Changes

• scripts/generate-sdk-v2.ts
  • discovers src/additional-types.ts per client (hasAdditionalTypes)
  • new copyAdditionalTypes() copies it to packages/epilot-sdk-v2/src/types/{api}-additional.d.ts, rewriting its from './openapi' import to from './{api}' (where the copied generated types live)
  • the generated src/apis/{api}.ts gains export type * from '../types/{api}-additional' when the client has such a file
• regenerated output: src/types/pricing-additional.d.ts (new) and src/apis/pricing.ts (one added re-export). pricing-client is currently the only client with an additional-types.ts, so nothing else changes.
• __tests__/additional-types.test.ts — regression guard: for every client that has an additional-types.ts, asserts the copied .d.ts exists, no longer points at ./openapi, and is re-exported from the API module; plus a type-level check that PriceTierEnhanced, Cart and AvailabilityDate are reachable from @epilot/sdk/pricing.
• changeset (@epilot/sdk patch).

After this, dist/apis/pricing.d.ts exports AvailabilityDate, Cart and PriceTierEnhanced, matching the surface of @epilot/pricing-client.

({api} above is a placeholder for an API name, e.g. pricing.)

Test plan

• pnpm generate-sdk produces exactly the two file changes above (no unrelated drift)
• pnpm build in packages/epilot-sdk-v2 — dist/apis/pricing.d.ts re-exports the three types
• npx vitest run __tests__/additional-types.test.ts — 3 passed; verified it fails when src/types/pricing-additional.d.ts is removed
• pnpm lint (biome) clean
• full pnpm test — 25 pre-existing failures in dist-integration / operations from the sandbox HTTP proxy rewriting axios base URLs (http://127.0.0.1:PORT + https://…); identical count on an untouched tree, so unrelated to this change. Needs a CI run to confirm green.

Follow-up (not in this PR)

Once a version with this fix is published, github/pricing's local PriceTierEnhanced in src/shared/types.ts can go back to being a re-export from @epilot/sdk/pricing.

Side note: the legacy Cart.status doc comment in additional-types.ts still describes open | complete | expired, but OrderStatus in the current spec is draft | quote | placed | cancelled | completed. Left as-is here.