Source-grounded write-up (docs/domain-score-tracking.md) covering the
score-entry data model, recording mechanism, the (unimplemented) high-score
table, and scoring formulas, with full file:line citations and edge-case
walk-through. Key finding: live in-memory HashMap<UUID,Integer> only; no
persistence, no high-score table, no formula — the title's 'high-score
table' is an aspirational stub (/score-archive unimplemented).
