Add allow_parallel to control concurrent task runs#10
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Introduce a three-level cascade setting (task > group > config) that prevents the coordinator from scheduling a task when it is already running. The check uses the Redis heartbeat key, so it works across multiple workers. - Add `allow_parallel` field to Config, TaskGroup, Task, and the dynamic task creation API - Implement cascade resolution in the coordinator - Update schemas, router services, and tests - Add documentation and changelog entry - Bump version to 1.0.1.alpha.1 - Update uv.lock with dependency bumps
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Summary
Add allow_parallel flag to control whether the same task can run concurrently across multiple instances. The setting follows a cascade resolution: task > task group > global config, defaulting to True (preserving backward compatibility). When set to False, the coordinator checks the Redis running key and skips tasks that are already executing.