docs(agents): add Cursor Cloud dev environment notes

[Robert27]

Summary

Sets up and verifies the development environment for the eggl Go CLI, and documents non-obvious caveats for future cloud agents.

This is a pure Go CLI with no servers/databases. The Go 1.26.3 toolchain is already present; dependency refresh is go mod download. Build, lint (go vet/gofmt), and the full race test suite (make check) all pass.

Changes

• Added a ## Cursor Cloud specific instructions section to AGENTS.md capturing durable caveats discovered during setup.

Caveats documented

• eggl dedash defaults to --path . and will rewrite tracked source files if run from the repo root; pass an explicit --path (and --yes for non-TTY).
• eggl doctor exits non-zero here because kubectl/tailscale are not installed (optional, only used by env/pf).
• eggl env init writes ~/.config/eggl/config.yaml; env show/pf need kubectl.

Testing

• make check (fmt-check + go test -race): all packages pass, 88.9% coverage.
• go vet ./...: ok
• go build -o bin/eggl .: ok
• Ran eggl version, eggl --help, eggl doctor, eggl env init, and a eggl dedash em-dash→hyphen transformation end-to-end.

eggl_dev_env_setup.log

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