fix: Replace any with unknown in pool function return type

[Copilot]

Code review identified that the internal pool function implementation used Task<any, any, any> as its return type, bypassing TypeScript's type safety.

Changes:

• Changed pool function return type from Task<any, any, any> to Task<unknown, unknown> (packages/common/src/Task.ts:3306)

Impact:

The pool function is an internal implementation with typed overloads that provide correct types to callers. Using unknown instead of any enforces proper type narrowing at any potential call sites that bypass the overloads, while maintaining full compatibility with existing code that uses the typed overloads.

// Before: loses type safety
function pool<T, E>(
  tasksIterable: Iterable<AnyTask>,
  options: { ... }
): Task<any, any, any> { ... }

// After: requires type narrowing
function pool<T, E>(
  tasksIterable: Iterable<AnyTask>,
  options: { ... }
): Task<unknown, unknown> { ... }

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