fix(push): ensure branches are rebased before pushing

[boneskull]

No description provided.

[boneskull]

Stack

• main
  • fix(push): ensure branches are rebased before pushing #12 - branch: push-updates (this PR)
  • feat(cmd): add submit command for unified cascade, push, and PR workflow #11 - branch: stack-submit

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Managed by gh-stack

[Copilot]

Pull request overview

This PR adds validation to ensure branches are properly rebased onto their parents before pushing. This prevents pushing stale branches that haven't incorporated changes from their parent branches.

Changes:

• Added pre-push validation that checks if each branch in the stack is properly rebased onto its parent
• Returns a helpful error message directing users to run gh stack cascade if a branch needs rebasing
• Added comprehensive end-to-end test coverage for the new validation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cmd/push.go	Added validation loop before pushing to check if each branch is properly rebased onto its parent, returning an actionable error if not
e2e/push_test.go	Added test case that verifies push fails with appropriate error message when a branch is not rebased onto its parent

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