feat: accept positional arg as primary input for single-subcommand groups

First positional arg falls back to the primary flag when --flag is omitted:

  minimax image "A cat in space"   →  image generate --prompt
  minimax search "MiniMax AI"      →  search query --q
  minimax vision photo.jpg         →  vision describe --image
  minimax speech "Hello"           →  speech synthesize --text (when routed)

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

Author: RyanLee-Dev

src/commands/image/generate.ts

@@ -31,7 +31,7 @@ export default defineCommand({
     'minimax image generate --prompt "Mountain landscape" --quiet',
   ],
   async run(config: Config, flags: GlobalFlags) {
-    let prompt = flags.prompt as string | undefined;
+    let prompt = (flags.prompt ?? (flags._positional as string[]|undefined)?.[0]) as string | undefined;
 
     if (!prompt) {
       if (isInteractive({ nonInteractive: config.nonInteractive })) {

src/commands/search/query.ts

@@ -31,7 +31,7 @@ export default defineCommand({
     'minimax search query --q "latest news" --output json',
   ],
   async run(config: Config, flags: GlobalFlags) {
-    const query = flags.q as string | undefined;
+    const query = (flags.q ?? (flags._positional as string[]|undefined)?.[0]) as string | undefined;
 
     if (!query) {
       throw new CLIError(

src/commands/speech/synthesize.ts

@@ -39,7 +39,7 @@ export default defineCommand({
     'minimax speech synthesize --text "Stream" --stream | mpv --no-terminal -',
   ],
   async run(config: Config, flags: GlobalFlags) {
-    let text = flags.text as string | undefined;
+    let text = (flags.text ?? (flags._positional as string[]|undefined)?.[0]) as string | undefined;
 
     if (flags.textFile) {
       const path = flags.textFile as string;

src/commands/vision/describe.ts

@@ -59,7 +59,7 @@ export default defineCommand({
     'minimax vision describe --file-id file-123456789 --prompt "Extract the text"',
   ],
   async run(config: Config, flags: GlobalFlags) {
-    let image = flags.image as string | undefined;
+    let image = (flags.image ?? (flags._positional as string[]|undefined)?.[0]) as string | undefined;
     let fileId = flags.fileId as string | undefined;
     const prompt = (flags.prompt as string) || 'Describe the image.';