Add Cursor Cloud dev environment setup (AGENTS.md)

AGENTS.md

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+# AGENTS.md
+
+## Cursor Cloud specific instructions
+
+Semaphore UI is a single product: a Go backend (REST API + WebSockets, serving the
+built Vue.js SPA) plus a Vue 2 frontend. The same binary runs the built-in task runner,
+so no separate runner process is needed for local development. Build orchestration uses
+[go-task](https://taskfile.dev) via `Taskfile.yml` (there is no Makefile).
+
+Standard build/lint/test commands live in `Taskfile.yml` and `CONTRIBUTING.md`; prefer
+those over duplicating them. Notable ones: `task build` (builds frontend into
+`api/public` then the `bin/semaphore` binary), `task lint:fe`, `task test` / `task test:be`.
+
+### Startup caveats (non-obvious)
+
+- The `task` binary is installed to `$(go env GOPATH)/bin`, which is not on `PATH` by
+  default. Either run it as `$(go env GOPATH)/bin/task ...` or add that dir to `PATH`
+  first. `bin/semaphore`, `vendor/`, `web/node_modules/`, and `api/public/` are all
+  git-ignored build artifacts; regenerate them with `task build` if missing.
+- The server needs a config file and at least one admin user, which are NOT created by
+  the update script (`config.json` and `database.sqlite*` are git-ignored). If they are
+  missing, create a SQLite dev config and seed the admin user before starting the server:
+  ```bash
+  cat > config.json <<'EOF'
+  {
+    "sqlite": { "host": "/workspace/database.sqlite" },
+    "dialect": "sqlite",
+    "cookie_hash": "5WJjXCLpvf3Cn5t+C/IV9F0asZUQLakOhCT+eSdIwP0=",
+    "cookie_encryption": "6x6mmQWGn6YcsHN1rN0HiQjhYA+7HukcbCxUGHuT2CE=",
+    "port": ":3000"
+  }
+  EOF
+  ./bin/semaphore user add --admin --login admin --name Admin \
+    --email admin@example.com --password changeme --config ./config.json
+  ```
+  The `user add` command also runs DB migrations. Default dev login: `admin` / `changeme`.
+- Run the server (serves API + UI at http://localhost:3000):
+  ```bash
+  ./bin/semaphore server --config ./config.json
+  ```
+  For active UI work with hot reload, additionally run `cd web && npm run serve`
+  (Vue dev server on :8080, proxies `/api` to :3000).
+- Use SQLite for local dev (BoltDB was removed in 2.19). MySQL/PostgreSQL are for
+  production and require a running DB server.
+- `task lint:be` needs `golangci-lint` + `swagger`, which are intentionally NOT installed
+  by `task deps` (commented out in `Taskfile.yml`). `task lint:fe` currently reports
+  pre-existing lint errors in the repo; they are not caused by environment setup.
+- Running real Ansible/Terraform task templates requires those CLIs; the devcontainer
+  installs Ansible into a `.venv`. The "demo project" auto-populates runnable resources
+  (e.g. a "Ping" Ansible template) useful for a quick end-to-end smoke test.