Core no longer owns or drives OS threads. The runtime is now a single
tick-driven worker whose loop an external engine hosts and advances.
This is the cutover required before the engine seam is introduced.
Removed from core:
- Runtime::run() and its owned thread pool (spawn, park/unpark, join)
- notify_worker() and worker_threads: Vec<OnceLock<Thread>> plumbing
- Placement load-aware selector and its WorkerStats-driven next_worker()
- WorkerId newtype and the address->worker routing map; AddressMap is
now a plain AddrSet membership set
- num_threads from RuntimeConfig
Rewired for the single-worker tick API:
- python/wasm bindings, dashboard dummy node (deleted), myelin vastai
adapter, and the runtime/test suites
Cleanup folded in during review:
- prune three never-written WorkerStats counters (cross_sends,
messages_dropped, restarts)
- collapse the redundant tick_all params onto the WorkerContext handle
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
Reduce idle cpu usage on my main machine from 17% to 1%. Made SWIM gossip more lazy.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
Make mailbox push infallible and replace the locked tick-timing buffer with a
lock-free ring.
- channel: HybridChannel::push and Sender::send now return () — overflow always
absorbs, never rejects — dropping the Result<(), T> surface and its callers.
- stats: tick_timings moves from Mutex<VecDeque> to a lock-free crossbeam
ArrayQueue (drop-oldest-on-full), removing the per-tick lock.
- ripple the signature change through worker/runtime/config; drop worker_benchmarks.
- expand runtime_api tests around the new channel/stats shapes.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
Trim runtime/worker/channel per coverage-fuzz findings; expand runtime_api tests; drop worker_benchmarks.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>
