schema.ts and validation.ts imported CHANNEL_IDS from channels/registry.js,
which re-exports from channels/ids.js but also imports plugins/runtime.js.
When the bundler resolves this dependency graph, the re-exported CHANNEL_IDS
can be undefined at the point config/validation.ts evaluates (temporal dead
zone), causing 'CHANNEL_IDS is not iterable' on startup.
Fix: import CHANNEL_IDS directly from channels/ids.js (the leaf module with
zero heavy dependencies) and normalizeChatChannelId from channels/chat-meta.js.
Fixes#48832
Co-authored-by: Brad Groux <bradgroux@users.noreply.github.com>
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