fix(cli) Add Mistral Vibe to recognized CLI agents

[doubledare704]

Description

Adds Mistral Vibe as a recognized CLI agent so Warp can detect vibe, display the correct agent name and brand color, route telemetry with a dedicated CLI agent type, and handle structured CLI agent session events.

Also adds focused test coverage for Vibe command detection, brand color, and session listener support.

Linked Issue

Closes #9607

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Screenshots / Videos

N/A

Testing

• cargo test -p warp vibe
• cargo test -p warp test_detect_known_agents

cargo nextest was not installed locally, so focused coverage was verified with cargo test.

Agent Mode

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

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@doubledare704

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Overview

This PR adds Mistral Vibe as a recognized CLI agent, including detection, display metadata, telemetry mapping, rich-input submission behavior, and structured session listener support.

Concerns

• [IMPORTANT] CLIAgent::Vibe defines a brand-colored avatar background but returns no icon, so the generic fallback icon uses theme sub_text rather than a contrast-safe foreground for the orange background.
• [IMPORTANT] This is user-visible because it changes the displayed agent name/color and CLI agent UI behavior, but the PR includes no screenshot or video. For faster review, please upload screenshots or a video of the feature working end to end.

Verdict

Found: 0 critical, 2 important, 0 suggestions

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[oz-for-oss]

⚠️ [IMPORTANT] Returning None makes Vibe use the generic terminal icon, which is colored with theme sub_text while the avatar background is MISTRAL_ORANGE; add a Vibe icon or update the fallback so branded agents without icons use a contrast-safe foreground.