make PWA chat resume idempotent
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@@ -323,6 +323,16 @@ Behavior notes:
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- `CHAT_SHELL_EXEC_TIMEOUT_MS=120000` (optional)
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- When a tool call is executed, backend stores a chat `Message` with `role: "tool"` and tool metadata (`metadata.kind = "tool_call"`). Streaming requests emit an initiated SSE `tool_call` event before execution, then persist each completed or failed tool call as its terminal SSE `tool_call` event is emitted, then store the assistant output when the completion finishes.
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## Streaming Chat
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### `POST /v1/chat-completions/stream`
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- The request accepts the chat-completion fields above plus optional `persist` and `clientRequestId` fields.
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- `clientRequestId` is only valid for a persisted request with a `chatId`, may be up to 128 characters, and should be a stable unique value generated once per user submission.
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- Retrying with the same `chatId` and `clientRequestId` replays the matching active or completed stream rather than starting a duplicate provider call.
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- The server persists the ID in `metadata.clientRequestId` on the submitted user message and completed assistant message.
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- The complete request, SSE event, persistence, retry, and attach contracts are defined in `docs/api/streaming-chat.md`.
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## Searches
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### `GET /v1/searches`
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