feat(setup-remotes): pin branch.main.pushRemote to origin

Direct pushes on the canonical branch now target upstream instead of
the personal fork whose branch-protection rules can diverge. Feature
branches still fall back to the fork via remote.pushDefault.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "git-maintainer-tools"
-version = "1.0.0"
+version = "1.1.0"
 description = "Small CLIs (git-setup-remotes, git-sign-push) for fork-based OSS maintainer workflows."
 readme = "README.md"
 requires-python = ">=3.10"