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Michael Suchacz
91c7232d97
Adds generic chat state and query capabilities that the lifecycle hooks integration (#27429) builds on. Part of the lifecycle hooks stack (#27401, #27429, #27430). - `chatstate`: `EditMessage` accepts caller-provided suffix messages inserted after the replacement in the same transaction, transitions can carry a typed error kind, and `FinishError` is also allowed from waiting chats so admission-time failures can park an idle chat in error. - `chatstate`: `ValidateToolResults` holds the submitted-tool-result rules (duplicate, invalid JSON, missing, unexpected) in one place, so `CompleteRequiresAction` and API-level prechecks reject the same payloads with the same typed causes. - `database`: `InsertChat` accepts an optional caller-provided ID. No hook-specific state or behavior is introduced here; these primitives are usable by any caller. An earlier revision added a message-content rewrite primitive so a `pre_tool_use` override could update an already-committed tool call. Message content is immutable by design, and @hugodutka pushed back on changing that. The rewrite is gone: #27429 now dispatches the hook before the assistant message is stored, so the stored input is the one that runs and nothing needs updating. > This PR was written by Mux, an AI coding agent, on Mike's behalf.