fix(devcontainer): clear root-owned __pycache__ before uv sync on attach

_pycache_ dirs created by root (during image build or prior root Python runs) cause permission errors when juice-data runs uv sync on attach. Wipe them with sudo before syncing so the attach never fails on stale pycache ownership.

Closes #381 (closed)

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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