The RYOW cache `TxnWildcardMultikeyPaths::appendMatchingPaths` currently returns every cached multikey path for a given `(collectionUuid, indexName)` bucket, ignoring the query's fieldSet. This was a deliberate simplification (SERVER-127544): faithfully mirroring `getMultikeyPathIndexIntervalsForField` — point-prefix probes plus a numeric-component range expansion — is subtle and bug-prone, and the cache is scoped to a single txn snapshot so realistic sizes are modest.

Goal:

• Add a `fieldSet` parameter back to `appendMatchingPaths` and filter cached paths to those that are prefixes of (or equal to) any queried field, including numeric-component range semantics from `getMultikeyPathIndexIntervalsForField`.