Add Cursor Cloud dev environment setup (AGENTS.md)

[fiftin]

Summary

Sets up and documents the development environment for Semaphore UI so future Cursor Cloud agents can build, test, and run the app.

• Adds AGENTS.md with a ## Cursor Cloud specific instructions section covering non-obvious startup caveats (go-task on PATH, git-ignored build artifacts, SQLite dev config + admin seeding, running the server, lint/test notes).
• Registers a minimal update script (dependency refresh only): install go-task, go mod vendor, and npm --prefix web install.

No application code was modified.

Verified in this environment

• task deps + task build (frontend → api/public, backend → bin/semaphore) succeed.
• go test ./... — all backend packages pass.
• Server runs at http://localhost:3000; API ping/login/user respond correctly.
• End-to-end UI smoke test: logged in as admin, created a demo project, ran the "Ping semaphoreui.com" Ansible task template with live streamed output ending in Success.

semaphore_login_create_project_run_task.mp4

Demo project created
Task run success with streamed output

Note: task lint:fe reports pre-existing lint errors in the repo (not related to this setup); task lint:be requires golangci-lint/swagger, which are intentionally not installed by task deps.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/setup-dev-environment-c26e

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