sisl/async: add stdexec scheduler primitives#319
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Add header-only async building blocks for sender-driven storage code. cqe_state bridges io_uring CQEs to callback-owned operation state; io_uring_scheduler exposes single-threaded schedule_at() and async_submit() senders on a caller-owned ring, batches submission in poll_once(), and flushes pending SQEs when the ring is full. Add manual_scheduler for deterministic virtual-time tests, wire the async test target behind an existing stdexec target, and cover timer ordering/past- deadline behavior. stdexec stays consumer-provided, so the module can remain header-only until sisl owns that dependency.
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Add header-only async building blocks for sender-driven storage code. cqe_state bridges io_uring CQEs to callback-owned operation state; io_uring_scheduler exposes single-threaded schedule_at() and async_submit() senders on a caller-owned ring, batches submission in poll_once(), and flushes pending SQEs when the ring is full.
Add manual_scheduler for deterministic virtual-time tests, wire the async test target behind an existing stdexec target, and cover timer ordering/past- deadline behavior. stdexec stays consumer-provided, so the module can remain header-only until sisl owns that dependency.