[Kaloyanes]

Depends on #1230. This branch is stacked on it (it merges pr/auto-link-opened-prs), so the diff below includes #1230's commits until that merges. The /pr change is the last commit, e453b199.

What changed

Adds a /pr command that pushes the session's branch and opens a GitHub pull request.

• A bare /pr (or /pr --draft) checks the branch, then puts a proposed title and body in the composer as editable /pr text. The title comes from the session; the body comes from the latest reply plus the branch's commits.
• Sending that text pushes with upstream tracking, runs gh pr create (with --draft when asked), and links the new PR to the session through Native: Link a session to the pull request its agent opens #1230's linking.
• If the branch already has an open PR, that PR is returned and nothing is pushed or created.

Each precondition has its own error message: a git repository, not detached, not the default branch, gh installed and signed in, no uncommitted changes (it suggests /commit), and commits ahead of the base.

Why

Opening a PR from a session meant asking the agent to do it, or leaving MonoCode for a terminal. /pr does it in one step, with a body you can edit before anything is pushed.

Where

• monocode-core/src/scm/open_pr.rs: the rules, behind a small PrTools trait for the git and gh calls, so they're tested with a fake.
• monocode-core/src/scm.rs: new gh_exec, git_capture and pr_url_from_output, which pr_create now shares.
• monocode-gpui/src/conversation/open_pr.rs, plus small hooks in conversation.rs, commands.rs, git_actions.rs and composer_completion.rs.

UI

No new chrome. /pr shows up in slash-command completion, and the proposed PR text goes in the composer.

Checks

None of the checks ran for this PR. The build machine is out of disk space (about 1.45 GB free), so cargo fmt --check, cargo check, cargo clippy -D warnings and the tests (including the PrTools fake tests in scm/open_pr.rs) have not run on this branch. I opened it as a draft so CI can run them; it stays a draft until they pass locally too.

Checklist

• I ran cargo fmt --check, cargo clippy -D warnings and the affected tests (not run, see above)
• This PR is small and focused
• I did not mix unrelated changes (apart from the Native: Link a session to the pull request its agent opens #1230 commits it's stacked on)

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