Clear stuck GitHub Actions runs without cancelling a deploy

**Objective:** Find the GitHub Actions runs in `{repository}` that have been queued or in progress for more than `{stale-hours}` hours (default 6), and cancel the ones the user approves.

**Step 1: Find the candidates**

Call `github-get-workflow-run` with company `{repository}` and status `queued`, then again with status `in_progress`. Keep only runs whose created-date is more than the threshold ago.

**Step 2: Check each one**

For each candidate, check whether a newer run of the same workflow name on the same branch exists. A superseded stuck run is the safest to cancel; say so.

**Step 3: Confirm**

Show a table: workflow name, run-number, branch, status, hours since created-date, superseded yes or no, url. Ask the user which runs to cancel. Default to none.

**Step 4: Cancel**

For each approved run, call `github-cancel-workflow-run` once, passing its workflow-run-id as run-id. Then re-read with `github-get-workflow-run` and report each run's final status.

**Rules & Guidelines:**

* Never cancel a run the user did not explicitly approve.
* Do NOT call `github-rerun-workflow-run`, `github-disable-workflow` or `github-enable-workflow`.
* Deployment workflows can be long-running on purpose; if a workflow name suggests a deploy or release, point that out before asking.

**Validation:**

* If no runs exceed the threshold, say so and stop.
* If a cancel fails, report it and carry on with the rest.