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f332c130ed
Callers need to know whether a channel is open before create/send, and had no way to ask without inferring it from a "channel already exists" error. Exposed at both layers so FFI consumers get the same answer. "Exists" means currently held by the manager, i.e. between a successful createReliableChannel and closeChannel. Persisted SDS state outlives a close, so a closed channel reports false -- this is a liveness check, not a "was this channel ever created" check. Cherry-picked from chore/channel-exists, which forked before the nim-ffi 0.2.0 migration. The FFI proc is re-expressed in the typed model, which also lets it carry a real bool instead of a "true"/"false" string; the hand-written header hunk is dropped since that header is generated now. Closes #4039 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>