feat(discord): clean up spam from verification channel

[austeyen]

Deletes slop from bots and users that persist in discord verification channel. Adds new env DISCORD_VERIFICATION_CHANNEL

[Copilot]

Pull request overview

This PR introduces a configurable “verification channel” gate for the Discord bot, intended to automatically delete non-verification chatter in a specific channel and prompt users to run the verify command. It adds a new environment variable to configure the channel and wires the enforcement into the message handler.

Changes:

• Add DISCORD_VERIFICATION_CHANNEL env var to Discord config.
• Log whether the verification-channel gate is enabled/disabled at startup.
• Add message enforcement that deletes non-verify messages in the configured channel and posts a short-lived reminder.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
discord/config/config.go	Adds DiscordVerificationChannel env var to config.
discord/config/verify.go	Logs whether DISCORD_VERIFICATION_CHANNEL is set (gate enabled/disabled).
discord/commands/verify.go	Introduces enforceVerificationChannel helper to delete non-verify messages and remind users.
discord/commands/handler.go	Calls verification-channel enforcement from the message handler.

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