Add agent CLI flag for cloud runs

[bnavetta]

Summary

• Adds --agent <UID> to warp agent run-cloud.
• Sends the value as agent_identity_uid, matching the public agent run API request field.
• Updates spawn request construction sites and tests for CLI parsing and request serialization.

Testing

• git --no-pager diff --check
• cargo nextest run --manifest-path /workspace/warp/Cargo.toml -p warp_cli agent_run_cloud_accepts_agent_flag
• CARGO_BUILD_JOBS=1 cargo check --manifest-path /workspace/warp/Cargo.toml -p warp --lib
• CARGO_BUILD_JOBS=1 cargo nextest run --manifest-path /workspace/warp/Cargo.toml -p warp spawn_agent_request_serializes_agent_uid_as_agent_identity_uid
• Not run: cargo fmt --manifest-path /workspace/warp/Cargo.toml --all --check (rustfmt is not installed in the sandbox toolchain)

Co-Authored-By: Oz oz-agent@warp.dev

Conversation: https://staging.warp.dev/conversation/e3cb2fc1-34d8-43cf-b8cd-fd894946656a
Run: https://oz.staging.warp.dev/runs/019dea24-d12b-719f-9ba4-bb9435d546df
This PR was generated with Oz.

[oz-for-oss]

@bnavetta

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[oz-for-oss]

Overview

This PR adds a --agent <UID> option to warp agent run-cloud, carries it through the ambient-agent spawn request as agent_identity_uid, and updates request construction sites plus focused CLI/serialization tests.

Concerns

• No blocking correctness or security concerns found in the annotated diff.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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