Add AGENTS.md with Cursor Cloud development environment instructions

[alokedesai]

Description

Adds AGENTS.md with Cursor Cloud-specific development environment instructions for future cloud agents. Documents key gotchas discovered during environment setup:

• OOM workarounds for full workspace test linking on 15GB VMs
• libstdc++.so symlink requirement for voice_input crate linking
• corepack enable requirement for command-signatures-v2 crate
• Pre-existing warp_completer test failures (feature flag initialization)
• Headless VM display limitations

Testing

Environment setup was verified end-to-end:

• cargo build --bin warp-oss --features gui — success
• cargo fmt -- --check — passed
• cargo clippy (full workspace) — passed
• cargo nextest run on key crates — 1308 tests passed
• generate_settings_schema binary — produces valid JSON schema output
• warp-oss binary — starts and reports expected EGL/display errors in headless environment

Build and test output:
settings_schema_output.log

CHANGELOG-NONE

  

[cla-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @cursoragent on file. In order for us to review and merge your code, each contributor must visit https://cla.warp.dev to read and agree to our CLA. Once you have done so, please comment @cla-bot check to trigger another check.