feat(json-rendering): serialize rich renderables structurally

[PakitoSec]

Summary

• add structured JSON serialization for Rich renderables under record.renderables instead of embedding ASCII output in text and record.message
• keep string-only rich logging in text, preserve file/plain rendering behavior, and document the new JSON contract and migration notes
• expand examples and tests for direct and queued logging, and bump the package version from 1.0.0b2 to 1.0.0

Testing

• updated pytest coverage in tests/test_core.py, tests/test_rich.py, and tests/test_mp.py for JSON console, JSON file, and multiprocessing serialization paths