feat: Add Line plugin (#1630)

* feat: add LINE plugin (#1630) (thanks @plum-dawg)

* feat: complete LINE plugin (#1630) (thanks @plum-dawg)

* chore: drop line plugin node_modules (#1630) (thanks @plum-dawg)

* test: mock /context report in commands test (#1630) (thanks @plum-dawg)

* test: limit macOS CI workers to avoid OOM (#1630) (thanks @plum-dawg)

* test: reduce macOS CI vitest workers (#1630) (thanks @plum-dawg)

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/gateway/server/plugins-http.ts

@@ -16,8 +16,30 @@ export function createGatewayPluginRequestHandler(params: {
 }): PluginHttpRequestHandler {
   const { registry, log } = params;
   return async (req, res) => {
-    if (registry.httpHandlers.length === 0) return false;
-    for (const entry of registry.httpHandlers) {
+    const routes = registry.httpRoutes ?? [];
+    const handlers = registry.httpHandlers ?? [];
+    if (routes.length === 0 && handlers.length === 0) return false;
+
+    if (routes.length > 0) {
+      const url = new URL(req.url ?? "/", "http://localhost");
+      const route = routes.find((entry) => entry.path === url.pathname);
+      if (route) {
+        try {
+          await route.handler(req, res);
+          return true;
+        } catch (err) {
+          log.warn(`plugin http route failed (${route.pluginId ?? "unknown"}): ${String(err)}`);
+          if (!res.headersSent) {
+            res.statusCode = 500;
+            res.setHeader("Content-Type", "text/plain; charset=utf-8");
+            res.end("Internal Server Error");
+          }
+          return true;
+        }
+      }
+    }
+
+    for (const entry of handlers) {
       try {
         const handled = await entry.handler(req, res);
         if (handled) return true;