The GitHub Actions job "Required Checks" on 
texera.git/gh-readonly-queue/main/pr-5597-891d2adbc8d096774121150eb079dfacdfded161
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Run started by GitHub user Yicong-Huang (triggered by Yicong-Huang).

Head commit for run:
249d115bd8e1df957466fa0ccb2e3a7a133989cd / yangzhang75 <[email protected]>
refactor(engine): pass Python worker startup arguments by name (#5597)

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### What changes were proposed in this PR?
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Passes Python worker startup configuration by name instead of by argv
position, as proposed in the issue.

PythonWorkflowWorker (JVM) previously built ~19 positional command-line
arguments, and texera_run_python_worker.py unpacked them positionally.
Because the two sides agreed only by index, adding/removing/reordering
one argument could silently misassign values.

- PythonWorkflowWorker.scala: build a single JSON object of named
startup-config keys and pass it as one argument.
- texera_run_python_worker.py: parse that JSON and read each value by
key; a missing or renamed key now raises a clear KeyError instead of
silently misaligning.

The set of keys written on the Scala side and read on the Python side is
identical (19 keys). No behavior change otherwise.

### Any related issues, documentation, discussions?
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Closes #5547

### How was this PR tested?
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- Verified the JSON key set written by PythonWorkflowWorker.scala
exactly matches the keys read in texera_run_python_worker.py (19 keys,
no drift).
- `WorkflowExecutionService/compile` (amber) succeeds.
- `scalafmtCheckAll` passes; scalafix rules (RemoveUnused,
ProcedureSyntax) are satisfied (the new import is used).
- Python entry script passes `py_compile`.
- End-to-end worker launch is exercised by the existing CI integration
jobs (amber-integration), which start a real Python worker.

### Was this PR authored or co-authored using generative AI tooling?
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Generated-by: Claude Code (Claude Opus 4.8)

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