Fix TypeError when OpenAPI Path Item Object contains non-HTTP-verb fields

[Copilot]

Summary

Path Item Objects that include summary, description, servers, or parameters fields (all valid per the OpenAPI spec) caused a TypeError: Cannot use 'in' operator to search for 'operationId' in <string> during code generation. The generator was blindly iterating all keys of a path item and passing each value to OperationCoder, which expects an operation object — not a string or array.

Original Prompt

Bug: Non-HTTP-Verbs (like Summary/Description) for a Path Item Object Field lead to TypeError

Using an OpenAPI spec with summary or description at the path level (e.g. paths./test.summary: "Test Summary") causes:

❌ Cannot use 'in' operator to search for 'operationId' in Test Summary

All fields in a path item are assumed to be HTTP operation objects, but the OpenAPI Path Item Object spec explicitly allows summary, description, servers, and parameters.

Manual acceptance tests

• An OpenAPI spec with summary and description on a path item starts counterfact without a TypeError
• Routes for the affected path (e.g. GET /test) are generated and respond correctly
• Specs without non-HTTP-verb path fields are unaffected
• Path-level parameters and servers fields also do not cause errors

Tasks

• src/typescript-generator/generate.ts — Added an HTTP_VERBS set (get, put, post, delete, options, head, patch, trace) and guard in pathDefinition.forEach to skip non-verb keys:

  const HTTP_VERBS = new Set(["get", "put", "post", "delete", "options", "head", "patch", "trace"]);
  
  pathDefinition.forEach((operation, requestMethod: string) => {
    if (!HTTP_VERBS.has(requestMethod)) return;
    // ...
  });

• test/typescript-generator/generate.test.ts — Added regression test: spec with path-level summary + description resolves without throwing and generates the expected route file

• .changeset/fix-path-item-non-http-verb-fields.md — Patch-level changeset entry