`hermes config set KEY '["-100","-200"]'` used to write the literal as one quoted
YAML string; the writer now emits a real list (acaac9a18, #88163) and the Telegram
gate decodes the legacy string shape (122ad719, #110213). The Discord, WhatsApp and
DingTalk gate parsers still comma-split that string into `{'["-100"', '"-200"]'}`,
so a config written before the writer fix silently locks every allowlisted chat,
channel or user out — with no warning.
Route every remaining comma-split gate through the shared
`gateway/platforms/_shared.py::decode_json_list_literal`:
- Discord `_gate_csv_set` (allowed/ignored/no-thread channels, allowed users/roles),
`_discord_free_response_channels` and `_missed_message_backfill_channels` now share
the one parser instead of three hand-rolled splits.
- WhatsApp `_coerce_allow_list` (allow_from, group_allow_from, free_response_chats).
- DingTalk `_csv_set` (allowed_users, allowed_chats, free_response_chats).
Plain CSV strings, YAML lists and malformed JSON keep their previous meaning.
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