Review tests without sync/async counterparts

[teremterem]

Parent: #90

Context

Several tests exist only in the sync or async variant with no direct counterpart. Some of these are intentionally different; others may benefit from having a counterpart added.

Tests to review

File	Test(s)	Notes
test_call_overrides_sync.py	test_config_params_work_with_sync_functions	Combined smoke test; async tests each param individually
test_call_overrides_async.py	9 individual param tests, test_config_kwargs_alongside_function_kwargs, test_call_override_with_inherit, test_call_override_with_global_default	No sync counterparts
test_function_decorator_sync.py	test_sync_function_runs_in_different_thread	Inherently sync-only
test_function_decorator_async.py	test_function_decorator_with_empty_parens	Async-only (sync needs explicit use_thread_pool=True)
test_method_function_decorator_async.py	4 empty-parens tests	Async-only
test_await_children_sync.py	test_await_children_sync_recursively_all_sync, test_await_children_sync_raises_on_event_loop_thread	Sync-specific scenarios
test_await_children_async.py	test_await_children_recursively_sync_children	Async root + sync children
test_promise_as_future_sync.py	test_concurrent_consumers_with_timeout	Thread-based concurrent access
test_promise_as_future_async.py	test_concurrent_consumers	Asyncio task-based concurrent awaiting
test_nesting_sync.py / test_nesting_async.py	Promising context tests differ	Sync can't separate call-site from execution
test_parent_resolution.py	Entire file	Has a TODO to expand into sync/async pairs

Action items

• For each test, decide: add a counterpart, document why it's intentionally solo, or leave as-is
• Address the TODO in test_parent_resolution.py

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