fix(cli): accept --format=webm in hyperframes lambda render

The CLI's `lambda render` subcommand's FORMATS allowlist and the
`RenderArgs.format` type still narrowed to `mp4 | mov | png-sequence`,
so even though the producer + aws-lambda packages now support webm
end-to-end, the CLI surface rejected it with `--format must be mp4|mov|
png-sequence`. Add webm to both spots and update the --help description.

Surfaced during real-AWS deploy prep — the local lambda-local /
distributed-simulated tests didn't go through the CLI so the gap went
unnoticed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jrusso1020

packages/cli/src/commands/lambda.ts

@@ -100,7 +100,7 @@ export default defineCommand({
     width: { type: "string", description: "Render width in pixels" },
     height: { type: "string", description: "Render height in pixels" },
     fps: { type: "string", description: "Render fps (24 | 30 | 60)" },
-    format: { type: "string", description: "mp4 | mov | png-sequence (default: mp4)" },
+    format: { type: "string", description: "mp4 | mov | png-sequence | webm (default: mp4)" },
     codec: { type: "string", description: "h264 | h265 (mp4 only)" },
     quality: { type: "string", description: "draft | standard | high" },
     "chunk-size": { type: "string", description: "Frames per chunk (default: 240)" },
@@ -325,7 +325,7 @@ function parseEnum<T extends string>(
   throw new Error(`${errorPrefix} must be ${allowed.join("|")}; got ${s}`);
 }
 
-const FORMATS = ["mp4", "mov", "png-sequence"] as const;
+const FORMATS = ["mp4", "mov", "png-sequence", "webm"] as const;
 const CODECS = ["h264", "h265"] as const;
 const QUALITIES = ["draft", "standard", "high"] as const;
 const CHROME_SOURCES = ["sparticuz", "chrome-headless-shell"] as const;

packages/cli/src/commands/lambda/render.ts

@@ -23,7 +23,7 @@ export interface RenderArgs {
   fps: 24 | 30 | 60;
   width: number;
   height: number;
-  format: "mp4" | "mov" | "png-sequence";
+  format: "mp4" | "mov" | "png-sequence" | "webm";
   codec?: "h264" | "h265";
   quality?: "draft" | "standard" | "high";
   chunkSize?: number;