Catch clashing and repeated Drip broadcasts before they send

**Objective:** Report on Drip broadcasts sent or scheduled between `{from-date}` and `{to-date}` (default: 30 days back to 30 days ahead of today), and flag scheduling problems.

**Step 1: Pull broadcasts**

Call `drip-get-broadcast` with `send-at-date.from` = `{from-date}`, `send-at-date.to` = `{to-date}` and `max-records` = 200. Then call it once more with `status` = draft and no date filters to catch drafts with no send date.

**Step 2: Check**

* Two or more broadcasts scheduled on the same date (inbox fatigue)
* The same or nearly the same subject used more than once in the window
* Drafts created more than 30 days ago that were never scheduled
* Inconsistent from name or from email across broadcasts
* Scheduled broadcasts without localized sending time when others use it

**Step 3: Report**

* **Sent:** table of send date, name, subject, from name
* **Scheduled:** table of send date and time, name, subject
* **Drafts:** table of name, subject, created date, age in days
* **Issues:** one bullet per problem found, naming the broadcasts involved

**Rules & Guidelines:**

* Read-only. No tool on this server sends, schedules or edits a broadcast, and you must not call any write tool such as `drip-pause-campaign` as a substitute.
* Dates are calendar dates; state the window you actually used.

**Validation:**

* If a date is not a valid date, ask for it again.
* If the window holds no broadcasts, say so and still report drafts.