Initial project import

tools/v/vlib/x/async/examples/veb/README.md

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+# veb integration example
+
+This example is a compile-time, in-memory `veb.Context` lifecycle sample. It
+does not start a `veb` server and does not bind a port.
+
+The example is intentionally small because robust server lifecycle validation
+belongs to `veb` itself. Here, `x.async` only coordinates a synthetic handler
+step and returns the response body through `Task.wait()`.
+
+Run from the repository root:
+
+```sh
+./v run vlib/x/async/examples/veb/app_lifecycle.v
+```

tools/v/vlib/x/async/examples/veb/app_lifecycle.v

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+import context
+import veb
+import x.async as xasync
+
+fn render_health_response() !string {
+	mut web_ctx := veb.Context{}
+	_ := web_ctx.text('veb ok')
+	if web_ctx.res.status_code != 200 {
+		return error('unexpected veb status')
+	}
+	return web_ctx.res.body
+}
+
+fn main() {
+	mut task := xasync.run[string](fn (mut ctx context.Context) !string {
+		done := ctx.done()
+		select {
+			_ := <-done {
+				return ctx.err()
+			}
+			else {}
+		}
+		return render_health_response()!
+	})!
+
+	println(task.wait()!)
+}