Find GitHub work that never reached Jira

**Objective:** Find the commits in repository `{repository}` (if blank, use the connector's default repository) from the last `{lookback-days}` days (default 14) that reference no existing issue in Jira project `{project-key}`.

**Step 1: Read the commits**

Call `github-get-commit` with `commit-date.from` set to today minus `{lookback-days}` days and `max-records` 500 (pass `company` = `{repository}` when given). If nothing comes back, report that there were no commits in the window and stop.

**Step 2: Pull the keys out of each message**

A Jira key is `{project-key}`, a hyphen and a number, for example ABC-123, in uppercase. Ignore merge commits whose message starts with Merge.

**Step 3: Confirm the keys exist in Jira**

Call `jira-get-issue` with `project-key` set to `{project-key}` and `max-records` 1000, once. A key found in a commit but absent from that list is a dangling reference. For a single dangling key you want to double-check, call `jira-get-issue` with `issue-key` set to it.

**Step 4: Map authors**

For each distinct `author-email` among the untracked commits, call `jira-get-user` with `email` set to it.

**Step 5: Report**

* **Untracked commits:** grouped by author (with Jira user, or "no Jira user"), each with short sha, date, first line of the message and url.
* **Dangling references:** commits naming a key that does not exist in Jira.
* **Totals:** commits in window, tracked, untracked, dangling.

**Rules & Guidelines:**

* `github-get-commit` is on the github server; `jira-get-issue` and `jira-get-user` are on the jira server.
* This prompt is read-only. Do NOT call `jira-add-issue` to create issues for untracked work; offer to run the escalate-github-issue-to-jira prompt instead.

**Validation:**

* If `jira-get-issue` returns exactly `max-records` rows, the key list may be incomplete. Verify each dangling key individually before reporting it.
* If no commit in the window carries any key, say the team may not reference Jira keys in commit messages rather than listing every commit as untracked.