docs: ENCOUNTER_BUILDER + TESTING guides for LLM session handoff
ENCOUNTER_BUILDER.md: DM interface — entity model (campaign/encounter/
participant), build flow (campaign→chars→encounter→participants), combat
controls (start/next/pause/HP/deathsaves/conditions), player display,
1-list turn order model, storage paths quick-ref.
TESTING.md: test+automation ops — commands, suites (90+24+66+4), layers
(L1 mock vs L2 live backend), types, TDD discipline, replay tool,
analyze-turns.js, audit tools, docker stack (single caddy+node container),
dev servers, storage modes, known RED backlog.
Both aimed at another LLM session picking up repo. DEVELOPMENT.md
cross-refs updated.
david raistrick
4406fd2045