Scenario: push-ahead

Only the monorepo changed since the clone.

• Monorepo (vendor/a/): cloned at seed, then a local commit.
• Upstream: seed, unchanged.

Output

setup.bash builds this state:

$ build_scenario scenario_push_ahead

$ git splice status
On branch main

  ahead 1  vendor/a

log shows the commit a push would publish, and who wrote it:

$ git splice log
===  vendor/a (main)
< e859a6b local change  (Test <test@example.com>)

push sends it. Nothing is written to the monorepo:

$ git splice push vendor/a
ok   vendor/a: pushed e859a6b to main

$ git splice status
On branch main

  up to date  vendor/a