fix: resolve vp run crash when task script contains global CLI subcommands (#766)

## Summary

- `vp run` crashed when a task script contained global-only commands like `vp config` because `CLIArgs::try_parse_from` failed on unrecognized subcommands with `ErrorKind::InvalidSubcommand`
- Now `InvalidSubcommand` errors return `HandledCommand::Synthesized` with `UserCacheConfig::disabled()`, letting the global CLI binary handle them as regular subprocesses without caching
- Also disabled cache for `vp exec` and `vp check` in task scripts, since they run arbitrary/composite commands with side effects

## Test plan

- [x] Added unit test `global_subcommands_produce_invalid_subcommand_error` confirming `config`, `create`, `env`, `migrate` produce `InvalidSubcommand`
- [x] Added snap test `command-run-with-vp-config` verifying `vp run foo` with `"foo": "vp config"` no longer crashes
- [x] All existing snap tests pass

Author: fengmk2

packages/cli/binding/src/cli.rs

@@ -671,12 +671,23 @@ impl CommandHandler for VitePlusCommandHandler {
         }
         // Parse "vp <args>" using CLIArgs — always use "vp" as the program name
         // so clap shows "Usage: vp ..." even if the original command was "vite ..."
-        let cli_args =
-            CLIArgs::try_parse_from(iter::once("vp").chain(command.args.iter().map(Str::as_str)))?;
+        let cli_args = match CLIArgs::try_parse_from(
+            iter::once("vp").chain(command.args.iter().map(Str::as_str)),
+        ) {
+            Ok(args) => args,
+            Err(err) if err.kind() == ErrorKind::InvalidSubcommand => {
+                return Ok(HandledCommand::Synthesized(
+                    command.to_synthetic_plan_request(UserCacheConfig::disabled()),
+                ));
+            }
+            Err(err) => return Err(err.into()),
+        };
         match cli_args {
             CLIArgs::Synthesizable(SynthesizableSubcommand::Check { .. }) => {
                 // Check is a composite command — run as a subprocess in task scripts
-                Ok(HandledCommand::Verbatim)
+                Ok(HandledCommand::Synthesized(
+                    command.to_synthetic_plan_request(UserCacheConfig::disabled()),
+                ))
             }
             CLIArgs::Synthesizable(subcmd) => {
                 let resolved = self.resolver.resolve(subcmd, &command.envs, &command.cwd).await?;
@@ -685,7 +696,9 @@ impl CommandHandler for VitePlusCommandHandler {
             CLIArgs::ViteTask(cmd) => Ok(HandledCommand::ViteTaskCommand(cmd)),
             CLIArgs::Exec(_) => {
                 // exec in task scripts should run as a subprocess
-                Ok(HandledCommand::Verbatim)
+                Ok(HandledCommand::Synthesized(
+                    command.to_synthetic_plan_request(UserCacheConfig::disabled()),
+                ))
             }
         }
     }
@@ -1660,4 +1673,20 @@ mod tests {
         let subcommand = SynthesizableSubcommand::Lint { args: vec!["src/index.ts".to_string()] };
         assert!(!should_suppress_subcommand_stdout(&subcommand));
     }
+
+    #[test]
+    fn global_subcommands_produce_invalid_subcommand_error() {
+        use clap::error::ErrorKind;
+
+        for subcommand in ["config", "create", "env", "migrate"] {
+            let error = CLIArgs::try_parse_from(["vp", subcommand])
+                .expect_err(&format!("expected error for global subcommand '{subcommand}'"));
+            assert_eq!(
+                error.kind(),
+                ErrorKind::InvalidSubcommand,
+                "expected InvalidSubcommand for '{subcommand}', got {:?}",
+                error.kind()
+            );
+        }
+    }
 }

packages/cli/snap-tests/command-run-with-vp-config/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "command-run-with-vp-config",
+  "version": "1.0.0",
+  "scripts": {
+    "foo": "vp config",
+    "bar": "vp not-exist-command"
+  },
+  "packageManager": "pnpm@10.19.0"
+}

packages/cli/snap-tests/command-run-with-vp-config/snap.txt

@@ -0,0 +1,26 @@
+> vp run foo # should run vp config command
+$ vp config ⊘ cache disabled
+.git can't be found
+
+Created AGENTS.md with Vite+ instructions
+◇  Add this MCP server config to your agent ─╮
+                                              
+   {                                          
+     "vite-plus": {                           
+       "command": "npx",                      
+       "args": [                              
+         "vp",                                
+         "mcp"                                
+       ]                                      
+     }                                        
+   }                                          
+                                              
+╰────────────────────────────────────────────╯
+
+
+[2]> vp run bar # should throw error
+$ vp not-exist-command ⊘ cache disabled
+error: Command 'not-exist-command' not found
+
+Did you mean `vp test`?
+

packages/cli/snap-tests/command-run-with-vp-config/steps.json

@@ -0,0 +1,3 @@
+{
+  "commands": ["vp run foo # should run vp config command", "vp run bar # should throw error"]
+}