Blueprints declare constructionDurationMinutes instead of tick counts. Delivering the last material starts construction at delivery time via maybeStartConstruction, setting constructionStartedAt/CompletesAt on the site; the game tick only sweeps completed sites. Structure detail page extracts server data helpers and shows a ConstructionPanel with a literal ETA countdown.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Add createBinLogger (src/scripts/lib/binFileLogger.ts): every log call
is appended synchronously to logs/<bin-key>/<YYYY-MM-DD>.log (UTC) in
addition to the console logger — sync writes because bin scripts
process.exit() immediately. Bin bodies are wrapped in try/catch so a
fatal error is logged to file and exits code 1. Override the directory
with BIN_LOG_DIR. logs/ is gitignored.
game-tick, market-tick, and processShipmentTick adopt the logger;
generate-mission follows with its clone fix; mission-tick lands with
its feature. Document BIN_LOG_DIR in .env.example and the logging in
AGENTS.md / README.
