refactor(cli): rely on Commander contracts (#106366)

src/cli/command-options.ts

@@ -2,19 +2,9 @@
 import type { Command } from "commander";
 
 export function hasExplicitOptions(command: Command, names: readonly string[]): boolean {
-  if (typeof command.getOptionValueSource !== "function") {
-    return false;
-  }
   return names.some((name) => command.getOptionValueSource(name) === "cli");
 }
 
-function getOptionSource(command: Command, name: string): string | undefined {
-  if (typeof command.getOptionValueSource !== "function") {
-    return undefined;
-  }
-  return command.getOptionValueSource(name);
-}
-
 // Defensive guardrail: allow expected parent/grandparent inheritance without unbounded deep traversal.
 const MAX_INHERIT_DEPTH = 2;
 
@@ -27,7 +17,7 @@ export function inheritOptionFromParent<T = unknown>(
     return undefined;
   }
 
-  const childSource = getOptionSource(command, name);
+  const childSource = command.getOptionValueSource(name);
   if (childSource && childSource !== "default") {
     return undefined;
   }
@@ -35,9 +25,9 @@ export function inheritOptionFromParent<T = unknown>(
   let depth = 0;
   let ancestor = command.parent;
   while (ancestor && depth < MAX_INHERIT_DEPTH) {
-    const source = getOptionSource(ancestor, name);
+    const source = ancestor.getOptionValueSource(name);
     if (source && source !== "default") {
-      return ancestor.opts<Record<string, unknown>>()[name] as T | undefined;
+      return ancestor.getOptionValue(name) as T | undefined;
     }
     depth += 1;
     ancestor = ancestor.parent;