feat: add support for Warp

[thinkverse]

Warp has added support for project-scoped rules files, WARP.md, in its latest stable update¹. This PR adds Warp as an agent so it can generate WARP.md if Warp or WarpPreview is detected on a user's system.

Opening this as a draft because I'm currently not sure how to detect it on Linux systems, maybe the .warp config folder is an option. I have asked the team at Warp and am waiting for a response on the way to detect it on Linux.

As for projectDetectionConfig, there isn't one. Warp is system-wide, unless WARP.md could work there, or is an empty paths correct?

I have tested this PR on Mac, and it does auto-detect Warp and generates the correct file:

Footnotes

1. https://docs.warp.dev/getting-started/changelog#id-2025.08.13-v0.2025.08.13.08.12 ↩

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[thinkverse]

I created a Docker container with Ubuntu and installed Warp using their .deb packages. That shows the binaries warp-terminal and warp-terminal-preview are added to /usr/bin when the respective versions are installed. So I followed the other detection patterns and used which for the Linux detection.