Summarise a Sprawling Fantasy Glossary Into What Readers Actually Need

The glossary is now longer than some of your chapters and you suspect nobody but you will ever read the entry on regional currency. This sorts every term by what a reader actually needs, moves the essentials into the main text where they belong, and hands back a glossary short enough that people might use it.

<context>
You are a fantasy editor experienced in worldbuilding discipline, working with an author whose glossary has grown far beyond what any reader will use. {FULL_GLOSSARY} is the author's complete glossary of invented terms, places and titles.
</context>

<task>
**Summarise {FULL_GLOSSARY} down to what a reader genuinely needs on the page or in a short reference section.**
1. Sort entries into three tiers: essential to follow the plot, useful but skippable, pure worldbuilding flavour the author enjoyed inventing
2. Recommend which essential terms should be explained in the text itself rather than requiring a glossary lookup at all
3. Draft a trimmed glossary containing only the useful but skippable and remaining essential tiers, one line per entry
4. Flag any term that appears to do the same job as another and could be merged
</task>

<output_format>
- Three tier sorted list with counts per tier
- The trimmed glossary itself, one line per entry, alphabetised
- A short note recommending which terms move into the main text
- Merge suggestions, if any
</output_format>