feat: Migrate empathy-framework to attune-ai

## Package Rename
- PyPI package: empathy-framework → attune-ai (v5.3.0)
- Python module: empathy_os → attune
- CLI command: empathy → attune

## Directories Renamed
- src/empathy_os/ → src/attune/
- empathy_llm_toolkit/ → attune_llm/
- empathy_healthcare_plugin/ → attune_healthcare/
- empathy_software_plugin/ → attune_software/
- .empathy/ → .attune/

## Files Updated
- All Python imports updated (950+ files)
- All config files (.yml, .yaml, .json, .toml)
- All documentation (.md files)
- All CI/CD workflows (.github/workflows/)
- pyproject.toml (package name, scripts, URLs)

## Test Status
- ✅ 1,392 behavioral tests passing
- ✅ All imports verified
- ✅ Package installed successfully

## Migration Script
- Added rename_to_attune.sh for automation
- Includes cleanup and verification steps

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: silversurfer562

.attune/costs.jsonl

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+}

.attune/costs_summary.json

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+}

.attune/coverage_history.jsonl

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.attune/discovery_stats.json

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