v1.6.3

Improve translation reliability, reduce heavy import overhead, and tighten release tooling around the uv workflow.

New Features:

• Add token-aware, scene-sensitive chunk splitting for long subtitle translation.
• Add chunked guideline generation for long subtitle files.

Other Changes:

• Fully defer heavyweight package-root imports and move torch/deepfilternet behind the optional full extra.
• Harden ChatBot and GeminiBot lifecycle handling, retry behavior, and error recovery.
• Reduce translation log noise and add OPENLRC_LOG_LEVEL.
• Improve line-mismatch retry behavior and raise the default context window to 32K.
• Replace runtime assert checks with explicit exceptions.
• Fix empty-translation early return, continuous-script duplicate word handling, and lazy import test stdout parsing.
• Gate long stress tests behind OPENLRC_TEST_STRESS and expand chunking/translation coverage.