Clamp messaging retry backoff delay

[seanwevans]

Summary

• clamp the retry delay calculation in connect_with_retries to avoid overflow
• add configuration for a maximum backoff interval and plumb it through the node startup
• extend messaging tests to cover the capped retry path

Testing

• cargo test (fails: database/task_recovery tests require a live database connection)

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https://chatgpt.com/codex/tasks/task_e_69020d5a8534832882ea8138ccf6b925

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