* Initial plan
* feat: add --workflow option to init command for post-init workflow execution
* chore: remove unused import in test file
* refactor: allow workflow run without project when given a YAML file path
Instead of adding --workflow to init, make `specify workflow run ./file.yml`
work without requiring a .specify/ project directory. When the source is a
YAML file that exists on disk, cwd is used as the project root. When it's a
workflow ID, the .specify/ project requirement is preserved.
* Handle standalone workflow path edge cases
* Fix USERPROFILE env var portability and docs notation
* Fix workflow YAML path detection to require regular files
* Harden workflow run against unsafe .specify paths
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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>