fix(speech): decode SSE stream and handle EPIPE gracefully

- Stream mode now parses SSE events, hex-decodes .data.audio, and
  writes raw binary MP3 to stdout (fixes --stream example piping to mpv)
- Add EPIPE handler to main.ts so piping to a downstream process that
  exits early (e.g. mpv, head) no longer crashes with unhandled error

Fixes #54

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: BLUE-coconut

src/commands/speech/synthesize.ts

@@ -3,6 +3,7 @@ import { CLIError } from '../../errors/base';
 import { ExitCode } from '../../errors/codes';
 import { request, requestJson } from '../../client/http';
 import { speechEndpoint } from '../../client/endpoints';
+import { parseSSE } from '../../client/stream';
 import { detectOutputFormat, formatOutput } from '../../output/formatter';
 import { saveAudioOutput } from '../../output/audio';
 import { readTextFromPathOrStdin } from '../../utils/fs';
@@ -98,14 +99,14 @@ export default defineCommand({
 
     if (flags.stream) {
       const res = await request(config, { url, method: 'POST', body, stream: true });
-      const reader = res.body?.getReader();
-      if (!reader) throw new CLIError('No response body', ExitCode.GENERAL);
-      while (true) {
-        const { done, value } = await reader.read();
-        if (done) break;
-        process.stdout.write(value);
+      for await (const event of parseSSE(res)) {
+        if (!event.data || event.data === '[DONE]') break;
+        const parsed = JSON.parse(event.data);
+        const audioHex = parsed?.data?.audio;
+        if (audioHex) {
+          process.stdout.write(Buffer.from(audioHex, 'hex'));
+        }
       }
-      reader.releaseLock();
       return;
     }
 

src/main.ts

@@ -17,6 +17,12 @@ process.on('SIGINT', () => {
   process.exit(130);
 });
 
+// Handle stdout EPIPE gracefully (e.g., piped to `mpv` that exits early)
+process.stdout.on('error', (e) => {
+  if (e.code === 'EPIPE') process.exit(0);
+  else throw e;
+});
+
 // Commands that manage their own auth or need no key
 const NO_AUTH_SETUP = [
   ['auth', 'login'],