Label cloud tab config as Cloud Agent behind harness flag

[zachbai]

Summary

• Rename the new-session cloud entry from "Cloud Oz" to "Cloud Agent" when FeatureFlag::AgentHarness is enabled.
• Keep the existing "Cloud Oz" label when the flag is disabled.
• Add focused workspace view tests for both feature flag states.

Validation

• CARGO_BUILD_JOBS=1 cargo nextest run --manifest-path /workspace/warp/Cargo.toml -E 'test(test_unified_new_session_menu_uses_cloud)'
• CARGO_BUILD_JOBS=1 cargo build --manifest-path /workspace/warp/Cargo.toml --bin warp
• Computer use verified the new-session menu row and sidecar both show Cloud Agent, with no visible Cloud Oz in that menu path.

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

Conversation: https://staging.warp.dev/conversation/7c7da8e4-5085-432e-ac23-e8311b5d06da
Run: https://oz.staging.warp.dev/runs/019e095d-97ab-7448-8e3b-7c8a7307318a
This PR was generated with Oz.

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@zachbai

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[oz-for-oss]

Overview

This PR changes the unified new-session menu cloud entry to display Cloud Agent when FeatureFlag::AgentHarness is enabled, while preserving Cloud Oz when the flag is disabled. The added tests cover both feature-flag states for the menu item selected by WorkspaceAction::AddAmbientAgentTab.

Concerns

• None found.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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