Find the ServiceNow articles that are letting readers down

**Objective:** Review the health of published knowledge, optionally in `{knowledge-base}`, flagging articles that expire within `{days-ahead}` days (default 30) or that readers are unhappy with.

**Step 1: Pull the articles**

Call `servicenow-get-knowledge` with workflow Published, knowledge-base `{knowledge-base}` if given, and max-records 500.

**Step 2: Pull the feedback**

* Call `servicenow-get-knowledge-feedback` with flagged true and created.from 90 days back.
* Call `servicenow-get-knowledge-feedback` with rating.max 2 and created.from 90 days back.
* Call `servicenow-get-knowledge-feedback-task`, once for state Open and once for Work in Progress.

Match feedback and tasks to articles by article number.

**Step 3: Apply the rules**

Flag an article when:

* valid-to is past (Expired, but still published) or within `{days-ahead}` days (Expiring)
* its rating is 2 or lower, or it has two or more low-rating feedback entries
* it has flagged feedback with no feedback task
* it has an open feedback task older than 30 days
* view-count is zero and it was published more than 180 days ago (Unused, candidate to retire)

**Step 4: Report**

A table, most flags first: number, short-description, knowledge-base, author, published, valid-to, rating, view-count, low ratings, flags, open tasks. Then a per-author count of flagged articles, and the five articles to fix first with why.

**Rules & Guidelines:**

* Read-only. Do not call `servicenow-update-knowledge`, `servicenow-add-knowledge-feedback-task`, `servicenow-update-knowledge-feedback` or any other add- or update- tool.

**Validation:**

* If no published articles match, say so and stop.