[Feature Request] Improve wait_condition semantics

Ideally, the following would not happen:

@workflow.defn
class WaitForSharedMutableStateWorkflow:
    def __init__(self) -> None:
        self.cond = False

    @workflow.run
    async def run(self):
        self.cond = True
        await asyncio.gather(self.coro("1"), self.coro("2"))

    async def coro(self, id: str):
        await workflow.wait_condition(lambda: self.cond)
        print(f"after wait coro {id} sees {self.cond}")  # ❗❗ <== coro2 sees False❗
        self.cond = False
        await asyncio.sleep(1)
        self.cond = True

Completely eliminating the possibility would be ideal, but best-effort improvements would also be welcome.

Start by reproducing the workflow.wait_condition example with asyncio.gather and the two coro calls shown in the issue, then inspect how wait_condition resumes concurrent workflows. Define and document the intended behavior for shared mutable state; done means the demonstrated coro2 sees False case is eliminated, or a clearly specified best-effort behavior is covered.