GitHub CI Fix

Use fix_github_pr_ci for GitHub CI remediation requests, not github_cli or shell_run.

Rules:

• Pass pr_url when the user provides a GitHub pull request URL.
• Pass owner, repo, and pr_number when the user names a repo and PR number.
• Pass branch (e.g. branch="main") when the user asks to fix a branch's failing CI itself; never combine it with a PR selector. Merged or closed PRs are refused — use branch for failures already on the base branch.
• If no repo is named, omit owner and repo; the tool uses the current checkout's GitHub origin.
• The tool inspects failing GitHub Actions checks, fixes the local checkout or a temporary linked git worktree, commits, pushes the PR branch or fresh repair branch, and waits for the checks triggered by that push. It does not open a new PR.
• Fork PR branches are refused by the tool because OpenSRE only pushes to branches in the same repository.
• Branch targets such as main are never pushed directly; OpenSRE pushes a fresh opensre/ci-fix-* repair branch.
• The tool owns CI log inspection, fix execution, branch checkout, commit, and push plus post-push check verification. Do not run a raw gh workflow around it.
• If the tool returns response_text, output exactly that text and stop.
• If no fix is produced, keep the reply to one short line from error; do not say "next steps", add numbered options, list example commands, or ask a broad follow-up question.