Reagent bug

## Testmerges
#10999: 'Fix of various plane related issues' by Blundir at commit f85a7153c4
#11661: 'Despoiler rework' by Git-Nivrak at commit c0f8d2884f
#11724: 'Point Blank Refactor [EXPERIMENTAL]' by TrollerNoob at commit 466ad883dc
#11680: 'Don't qdel tgui windows' by Drulikar at commit 0499627b55
#11368: 'FTL Hijack Evacuation' by Drulikar at commit 75c4efe419
#11555: 'Adds tethering to some storage items' by Nihisohel at commit 17401339ec
#8991: 'Medical Rework Phase 1 - Chemical Changes' by Nihisohel at commit cae6f0c929

## Round ID
32705

## Description of the bug
theres a new chem on the research objective list called "reagent"

## What's the difference with what should have happened?
it cant be obtained in any way

## How do we reproduce this bug?
1) read the objectives...

## Attached logs
```
N/A
```

## Additional details
- Author: ScrTheChad
- Admin: the tobiasreaper
- Note: Occasionally also shows up as a ingredient for a research chem

Reproduce the issue by reading the research objectives and checking the “reagent” entry, which is reported as unobtainable and sometimes used as a research-chemical ingredient. No file, test, or code entry point is identified; trace the objective and ingredient definitions, then verify that the entry can be obtained or is removed.

Written by the indexing model from the issue text.