fix: retry transient pipe open failures after use(filepath)

[Leela8256]

Handle transient startup races in the Python SDK by retrying DataPipe.open() on short-lived connection-refused errors after use(filepath=...), and add a regression test for the documented use(filepath) -> send(...) flow.

Summary

• Add bounded retry logic in DataPipe.open() for transient connection-refused errors during task data-port warm-up
• Preserve existing behavior by failing immediately for non-transient pipe-open errors
• Add Python SDK regression test covering use(filepath=...) followed by send(...) (Issue client.send() doesn't trigger the engine and throws an error #460 docs flow)

Affected Files

• packages/client-python/src/rocketride/mixins/data.py
• packages/client-python/tests/RocketRideClient_test.py

Type

fix

Testing

• Tests added or updated
• Tested locally
• ./builder test passes

Checklist

• Commit messages follow conventional commits
• No secrets or credentials included
• Wiki updated (if applicable)
• Breaking changes documented (if applicable)

Linked Issue

Fixes #460

co-author: cursor

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