## Why
Cloud messages previously accepted only plain text, and switching a draft to Cloud waited for session preparation without processing composer input.
## What changed
- Support ordered text and image parts in Cloud submissions and user-message summaries, preserving attachment placeholders, image detail, and client message IDs.
- Accept inline data URLs and uploaded file IDs, including image-only messages. Reject invalid references and text spans locally, and cap encoded image requests at 3.75 MiB while retaining the existing plain-text limit.
- Keep the composer editable and redraw the TUI while Cloud prepares a conversation. Carry the latest draft, attachments, and Vim mode into the destination, retain drafts on failure, and prevent submission to the outgoing session during the handoff.
- Preserve buffered paste input and pending clipboard reads across the handoff, with connection and failure hints.
## Testing
Add regression coverage for image wire encoding, receipt identity, validation and size boundaries, draft editing during successful and failed handoffs, clipboard completion, Vim state, and attachment recovery after rejected submissions.
GitOrigin-RevId: 0cbcde0ab89ba961780b5f88456057e6b6a19cd5
## Why
`Attach` delivers live events only. Clients also need access to stored turn metadata and item content.
## What changed
- Add `Client::list_turns` and `Client::list_items` using native gRPC history endpoints, with optional turn filtering for items.
- Expose page limits, sort order, access mode, and forward/backward cursors. Each call returns one page in server order without automatic pagination or retries.
- Preserve raw response and row payloads alongside typed summaries and item timestamps. Retain unknown item variants and command sources without typed summaries.
- Document cursor reuse and history/live overlap: history pages do not provide an atomic boundary with `Attach`, and coordinated reconciliation still requires caller-managed state.
## Testing
Add wire-fixture tests for request encoding, explicit pagination, raw payload preservation, unknown data, malformed rows, empty pages, RPC errors without retries, and diagnostic redaction.
GitOrigin-RevId: f507530b8e431236bc7e19d867517af56f74644f
## What changed
Decode live item start and completion notifications as `TranscriptUpdate::ItemStarted` and `TranscriptUpdate::ItemCompleted`, with turn identity, lifecycle timestamps, and summaries for user messages, agent messages, reasoning, commands, and file changes.
Preserve structured agent questions even when message text is empty, optional command output and exit details, and command or patch status independently of lifecycle completion. Keep unsupported or incomplete items as opaque notifications and redact summary fields in debug output.
## Testing
Add fixtures covering lifecycle ordering alongside deltas, identity and timestamps, status and optional-field preservation, structured questions, opaque fallback, malformed payloads, thread ownership, and debug redaction.
GitOrigin-RevId: d6bf2d25ee85be17d895726c5072850a9851b55f
Benjamin Carlsson