70 support different errors with the same http status code

[tomsontom]

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[tomsontom]

Review

This PR adds support for multiple distinct errors sharing the same HTTP status code (#70). Traced the generated output (Java JDK client, TS fetch client, OpenAPI JSON) for the new multiErrorSameCode sample operation and confirmed the dispatch/fallthrough logic (if (status == X) { if (header == "ErrorName") {...} }) is correct in all generators, and the OpenAPI oneOf collection for multiple errors per status code works as intended.

One cleanup item:

dsl/packages/cli/src/open-api/service.ts:113-164 — dead commented-out code left over from the refactor. A ~50-line block of the old per-result error-handling logic (/*if (r.error) {...}*/) is left commented out inside the .forEach that now only handles non-error results. It's unreachable and duplicates logic that now lives in toErrorType/errorsByCode.forEach below — should be deleted.

🤖 Generated with Claude Code