Restore codebase deleted by bad auto-commit e4227cf

Commit e4227cf (a story creation auto-commit) erroneously deleted 175
files from master's tree, likely due to a race condition between
concurrent git operations. This commit re-adds all files from the
working directory.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/http/health.rs

@@ -0,0 +1,66 @@
+use poem::handler;
+use poem_openapi::{Object, OpenApi, Tags, payload::Json};
+use serde::Serialize;
+
+/// Health check endpoint.
+///
+/// Returns a static "ok" response to indicate the server is running.
+#[handler]
+pub fn health() -> &'static str {
+    "ok"
+}
+
+#[derive(Tags)]
+enum HealthTags {
+    Health,
+}
+
+#[derive(Serialize, Object)]
+pub struct HealthStatus {
+    status: String,
+}
+
+pub struct HealthApi;
+
+#[OpenApi(tag = "HealthTags::Health")]
+impl HealthApi {
+    /// Health check endpoint.
+    ///
+    /// Returns a JSON status object to confirm the server is running.
+    #[oai(path = "/health", method = "get")]
+    async fn health(&self) -> Json<HealthStatus> {
+        Json(HealthStatus {
+            status: "ok".to_string(),
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn handler_health_returns_ok() {
+        let app = poem::Route::new().at("/health", poem::get(health));
+        let cli = poem::test::TestClient::new(app);
+        let resp = cli.get("/health").send().await;
+        resp.assert_status_is_ok();
+        resp.assert_text("ok").await;
+    }
+
+    #[test]
+    fn health_status_serializes_to_json() {
+        let status = HealthStatus {
+            status: "ok".to_string(),
+        };
+        let json = serde_json::to_value(&status).unwrap();
+        assert_eq!(json["status"], "ok");
+    }
+
+    #[tokio::test]
+    async fn api_health_returns_ok_status() {
+        let api = HealthApi;
+        let response = api.health().await;
+        assert_eq!(response.0.status, "ok");
+    }
+}