Xubin Ren f0f0bf02d7 refactor(channel): centralize retry around explicit send failures
Make channel delivery failures raise consistently so retry policy lives in ChannelManager rather than being split across individual channels. Tighten Telegram stream finalization, clarify sendMaxRetries semantics, and align the docs with the behavior the system actually guarantees.
2026-03-25 22:37:11 +08:00
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