[Anon] Pirates (1b): Can't add boathouse to boatswain, current boats ain't has error saying it can't use hidden

**Problem:**
Can't add boathouse to boatswain, current boats ain't has error saying it can't use hidden

**Expected:**
Be able to use equipment from the pirates rulebook

**List:** https://www.newrecruit.eu/app/list/jFjFy
**Unit:** Boatswains, id: 8525-9777-d412-5fa9
**NewRecruit Version:** 34.67
**Platform:** Web
**Language:** en
**User Agent:** Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/30.0 Chrome/143.0.0.0 Safari/537.36

Start with the linked NewRecruit list and the Boatswains unit identified by id 8525-9777-d412-5fa9, then inspect the repository data for its equipment restrictions and the Pirates rulebook entry. Verify that boathouse equipment is available to Boatswains and that the resulting list no longer reports it as hidden.

Written by the indexing model from the issue text.