Change handoff conversations to use "<original conversation title> (Moved to cloud)" for the new conversation title

[harryalbert]

Description

WISOTT. The bulk of this change is on the server-side to allow the conversation forking endpoint to accept custom titles (because the conversation forking endpoint we use for handoff is generic, so we can't just change the title there by default to include "moved to cloud").

On the client, we just have to pass this new field in, and also pass in a custom title field for our new task.

Testing

• I have manually tested my changes locally with ./script/run

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[harryalbert]

• Change handoff conversations to use "<original conversation title> (Moved to cloud)" for the new conversation title #10603 👈 (View in Graphite)
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@harryalbert

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[oz-for-oss]

Overview

This PR threads an optional custom title through conversation forking, local-to-cloud handoff state, and cloud run spawning so handed-off conversations use the original title with the "(Moved to cloud)" suffix.

Concerns

• No blocking correctness, security, or error-handling concerns found in the changed lines.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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[captainsafia]

LGTM!