isChannelId (src/channels.ts)

Defines canonical channel IDs and helper functions for channel validation and bot provider mapping.

// Source: https://github.com/vellum-ai/vellum-assistant | License: MIT | Copyright 2025 Vellum AI
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Canonical channel-id vocabulary shared between the assistant daemon and the
 * gateway.
 *
 * A "channel" is an external messaging surface an actor can reach the
 * assistant through (Slack, Telegram, WhatsApp, phone, …) plus a couple of
 * internal ids (`vellum` for native app conversations, `vellum-shared` for
 * conversations a guardian shares with a contact, `platform` for the internal
 * control plane). This is the single source of truth for that set:
 *
 * One id, `plugin`, does not name a surface: it names *every* surface a plugin
 * brings. A plugin channel's real identity is the plugin, which is workspace
 * stat

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