fix(core): spawn shell non-interactively without sourcing rc files

ShellSelect.args() ran zsh/bash with -l and explicitly sourced .zshrc/.bashrc,
loading user functions and aliases that can shadow builtins and return non-zero
exit codes, breaking && chains. Match the old tool behavior: plain non-login
non-interactive shell -c command with cwd passed via spawn options.

packages/core/src/shell.ts

@@ -159,7 +159,7 @@ export const layer = Layer.effect(
       const cwd = input.cwd ?? location.directory
       const configShell = Config.latest(yield* config.entries(), "shell")
       const shell = ShellSelect.preferred(configShell)
-      const args = ShellSelect.args(shell, input.command, cwd)
+      const args = ShellSelect.args(shell, input.command)
       const file = path.join(outputDir, `${id}.out`)
       const env = {
         ...process.env,