* fix: move draft and template context handling out of create_workflow_run
create_workflow_run now only creates
the run with the definition_id and initial_context provided by the caller. Test call paths explicitly resolve draft definitions
and merge template context variables before creating the run, while production/runtime paths bind the published definition
without adding template defaults.
* fix: review comments
* chore: format and minor cleanups
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Co-authored-by: Abhishek Kumar <abhishek@a6k.me>
