Fork publication fails with current GitHub CLI

[eohjelle]

When the authenticated user cannot push to the canonical roadmap repository, push_target() invokes:

gh repo fork <repository> --clone=false --remote=false

Current GitHub CLI rejects --remote whenever a repository argument is provided, before creating the fork. --clone=false alone provides the required noninteractive behavior.

Remove --remote=false and test the no-canonical-push publication path against a supported GitHub CLI version.

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