fix(native-chat): honor saved agent Command and Arguments (#25721)

* fix(native-chat): honor saved agent launch commands and arguments

* fix(test): retain provider import after syncing main

* fix(native-chat): preserve launch arguments and explain invalid settings

* refactor(native-chat): require the current launch arguments source

* fix(native-chat): require saved arguments when installing the runtime

* fix(native-chat): show saved argument refusals beside launch retry

* fix: ship saved-argument error messages in every locale

* test: align model discovery with executable overrides

* chore: drop the local pnpm install lockfile block

src/shared/node-cli-command-resolution.ts

@@ -278,6 +278,27 @@ export function resolveCliCommand(
   return installCandidate ?? commandName
 }
 
+/** Resolve a literal override without falling back to an unverified command name. */
+export function resolveExecutableCommand(
+  command: string,
+  options: ResolveCommandOptions = {}
+): string | null {
+  const platform = options.platform ?? process.platform
+  const expanded =
+    command.startsWith('~/') || command.startsWith('~\\')
+      ? join(options.homePath ?? homedir(), command.slice(2))
+      : command
+  if (isAbsolute(expanded)) {
+    return isRunnableCommand(platform, expanded) ? expanded : null
+  }
+  // Relative paths depend on the workspace, which a session-less catalog cannot name.
+  if (expanded.includes('/') || expanded.includes('\\')) {
+    return null
+  }
+  const resolved = resolveCliCommand(expanded, options)
+  return isAbsolute(resolved) && isRunnableCommand(platform, resolved) ? resolved : null
+}
+
 export function resolveCliCommands(
   commandNames: readonly string[],
   options: ResolveCommandOptions = {}