Update handoff surfaces to allow for empty prompts (and auto-handoff on click)

[harryalbert]

Description

Building off of the changes from the PR below this one in the stack, we now want to change all of the client handoff surfaces to allow for handing off without a prompt (and to take advantage of this instant handoff flow).

Specifically, we change it so that:

• clicking the handoff chip (when the prompt is empty) automatically kicks off handoff
  • if the conversation is in progress when handing off, a "continue" prompt is auto-inserted so the agent continues its work stream in the cloud
  • if the conversation has some snapshots to restore, a prompt is inserted to do snapshot restoration. Otherwise, we would skip snapshot restoration entirely (or do it without a user visible prompt)
  • if neither of these are true, we just handoff with no prompt
• typing /handoff with no prompt also automatically kicks off handoff (with the same prompt semantics as above)
• We listen for the new AmbientSetupPhaseEnded session sharing message from this PR to exit the environment setup phase, removing our dependency on a prompt event to do this.

Testing

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

Screenshots / Videos

https://www.loom.com/share/e748b81a3e22418f9e9836acf56c06c1

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

[harryalbert]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Update handoff surfaces to allow for empty prompts (and auto-handoff on click) #11576 👈 (View in Graphite)
• Remove prompt requirement from cloud run initiation #11573
• master

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[harryalbert]

I'll update this once the session sharing proto is merged

[oz-for-oss]

@harryalbert

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[oz-for-oss]

Overview

This PR updates local-to-cloud handoff paths to support empty prompts, adds skip-initial-turn handling, and introduces the AmbientSetupPhaseEnded shared-session marker.

Concerns

• Cargo.toml is still wired to a testing-only local session-sharing-protocol path dependency, which makes builds depend on an unpinned sibling checkout and must be reverted to a reviewed git revision before merge.

Security

• The local path dependency is a supply-chain/reproducibility risk because the build can resolve whatever code is present outside the repository instead of the reviewed protocol revision.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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