[LunaUrsa]

Summary

• /purge: rename the private option to ephemeral (the code read ephemeral, so the reply was always public) and make the reply hidden by default. Closes /purge reads option 'ephemeral' but the option is named 'private' #1382.
• Register slash commands on every bot start. It hashes the definitions and skips the Discord call when they match the last successful deploy, so tsc-watch restarts don't hit rate limits. A failure is logged and doesn't stop the bot; npm run tripbot:deployCommands still always deploys and exits on failure.
• AGENTS.md: document the "ephemeral option, hidden by default" rule for commands and the deploy-on-start behavior.

Notes

• The /purge option name and description changed, so this needs a command redeploy (the start-up deploy now does that on restart).
• Deploy-on-start runs in every environment. entrypoint.sh already has an opt-in DEPLOY_DISCORD_COMMANDS_ON_START; with it set, Docker deploys once before start and once on start, and the second is skipped only if the hash file survived.
• Other commands keep their opt-in ephemeral option; they aren't changed here.

Verification

• npx vitest run src/discord/tests/utils src/discord/tests/guild/mid_guild_commands.test.ts: 620 passed, 1 expected fail.
• npx tsc --noEmit clean; ESLint clean on the changed files except two object-curly-newline errors on a line already in mid_guild_commands.test.ts.

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