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Archived chats accept mutations (messages, edits, queued-message promotions, tool-result submissions) via the API, causing them to re-enter the processing pipeline. This violates the hard-stop design intent from PR #23758. Add archived checks at three layers: - HTTP handlers (postChatMessages, patchChatMessage, promoteChatQueuedMessage, postChatToolResults): return 400 after auth so callers get a clear error. - Daemon functions (SendMessage, EditMessage, PromoteQueued, SubmitToolResults): return ErrChatArchived after row lock, guarding against future callers that bypass the handler. - AcquireChats SQL: filter out archived chats so they are never acquired for processing. Fixes CODAGT-245