preserve container worker import path

[pmbstyle]

Summary

• stop forwarding the host PYTHONPATH into Docker workers
• preserve the worker image's /app/src import path when the project is not installed into the image environment
• lock the launcher and image contracts with focused regression coverage

Root cause

The dependency-only worker image correctly defines PYTHONPATH=/app/src, but the launcher replaced it with the host interpreter path through docker run -e. Fresh worker containers therefore could not import the package entrypoint.

Validation

• 37 focused launcher, image-contract, and fingerprint tests
• full Python test suite (one expected Windows-only skip)
• Ruff, Black, MyPy, and diff checks
• direct import smoke against the rebuilt worker image

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 0c1a014f-83b4-4e5e-a511-649fd4ffc194

📥 Commits

Reviewing files that changed from the base of the PR and between 4b1f36d and 8bc95f6.

📒 Files selected for processing (3)

• src/octopal/runtime/workers/launcher.py
• tests/test_worker_image_contract.py
• tests/test_worker_launcher_isolation.py

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