Feature 05: HTTP Executor Hardening

HTTP callback reliability was improved for command and handlerOn use cases.

What Changed

Environment expansion for command-derived method values.
Environment expansion for URL argument values.
Environment expansion for query values.
Explicit URL-required validation with clear error behavior.

Full HTTP Workflow Example

steps:
  - name: get fake json data
    executor:
      type: http
      config:
        timeout: 10
        headers:
        silent: true
        query:
          postId: "1"
        body: ""
    command: GET https://jsonplaceholder.typicode.com/comments