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Hot reload for worker runtime parameters #385

Description

@xyzbety

Problem

Worker runtime parameters are currently read at startup only. In practice, changes to scheduling interval, concurrency, timeout, retry, and rate-limit settings usually require a worker restart to take effect. That adds operational overhead and makes online tuning harder.

Request

Support hot reload for worker runtime parameters so configuration changes can take effect without restarting workers.

Suggested scope

  • Runtime knobs: poll_interval, claim_batch_size, deadline_duration, priority_aging_interval, concurrency, rate limiting, and similar settings.
  • Declarative worker-owned business config: include it if it is safe to update online.

Out of scope

  • Task code
  • Execution logic
  • One-off task inputs

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