One-line JSDoc on 82 methods across 11 service files for quick
scanning without reading full implementations.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Provide non-obvious business rules and constraints for economy,
inventory, quest, moderation, trade, and trivia modules to reduce
context-gathering overhead for AI tools.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace raw `Error` with `UserError` for user-facing conditions (invalid trade state, user not found, permission/channel type checks) and `SystemError` for internal failures (DB insert failures, external API errors, missing config). Improves Discord UX by ensuring user-facing errors are surfaced cleanly via withCommandErrorHandling.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
