feat: deepen async concurrency seams - #260
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Move sync host work (config load, shell conditions, clone fs ops) off Tokio workers via host_blocking; add Runner cancellation and JoinSet for parallel layers. Gate::admit acquires exclusive lanes, per-Task sub-quotas for parallel tasks, then work permits. ChannelSink uses bounded mpsc with block_in_place backpressure — never blocking_send directly on a worker (that path panics). Intern command_desc as Arc<str> alongside task_name. Update ADR-0003/0005 and CONTEXT to match.
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Summary
host_blockingJoinSet;ConcurrencyGate::admitwith per-Task sub-quotasChannelSink(8192) withblock_in_placebackpressure (no workerblocking_sendpanic)command_descasArc<str>; update ADR-0003/0005 and CONTEXTTest plan
make test/make lint