fix(macronizer): Morpheus accents now reach the output for unknown words

Sync of the engine fix (latin-macronizer-wasm 797f779). Words absent from
macrons.txt were macronized by the tag_to_endings heuristic instead of
Morpheus's analysis, because (1) the accented form kept the ",lemma"
suffix from Morpheus beta-code, and (2) addEntry left a stale empty
entriesCache so getAccents never saw the row it had just written.

currito -> curritO (was currItO), diffregit -> diffrEgit (was all-short).
Verified first-visit and return-visit; macronizer e2e + 81 node tests pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: hellpanderrr