feat(chaos): extend chaos support to handleVideoStatus

handleVideoStatus (GET /v1/videos/{id}) was the only handler missing
chaos support. Wires applyChaos into the polling path so tests can
inject drop / disconnect / malformed for video-status checks too.

Since video status polling has no proxy path, it passes null for
fixture and "fixture" for source.

Widens ChaosJournalContext.body to accept null (matching
JournalEntry.body) so handleVideoStatus can pass null without an
unsafe cast.

Author: claude

src/chaos.ts

@@ -131,7 +131,7 @@ interface ChaosJournalContext {
   method: string;
   path: string;
   headers: Record<string, string>;
-  body: ChatCompletionRequest;
+  body: ChatCompletionRequest | null;
 }
 
 /**

src/server.ts

@@ -1196,7 +1196,7 @@ export async function createServer(
     const videoStatusMatch = pathname.match(VIDEOS_STATUS_RE);
     if (videoStatusMatch && req.method === "GET") {
       const videoId = videoStatusMatch[1];
-      handleVideoStatus(req, res, videoId, journal, setCorsHeaders, videoStates);
+      handleVideoStatus(req, res, videoId, journal, defaults, setCorsHeaders, videoStates);
       return;
     }
 

src/video.ts

@@ -191,13 +191,29 @@ export function handleVideoStatus(
   res: http.ServerResponse,
   videoId: string,
   journal: Journal,
+  defaults: HandlerDefaults,
   setCorsHeaders: (res: http.ServerResponse) => void,
   videoStates: VideoStateMap,
 ): void {
   setCorsHeaders(res);
   const path = req.url ?? `/v1/videos/${videoId}`;
   const method = req.method ?? "GET";
 
+  if (
+    applyChaos(
+      res,
+      null,
+      defaults.chaos,
+      req.headers,
+      journal,
+      { method, path, headers: flattenHeaders(req.headers), body: null },
+      "fixture",
+      defaults.registry,
+      defaults.logger,
+    )
+  )
+    return;
+
   const testId = getTestId(req);
   const stateKey = `${testId}:${videoId}`;
   const video = videoStates.get(stateKey);