rappct 0.12.3

Rust AppContainer / LPAC toolkit for Windows (profiles, capabilities, process launch, diagnostics).
Documentation
## Summary

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## Testing

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- [ ] cargo test
- [ ] cargo fmt
- [ ] Other (details below)

## Breaking Changes

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## Checklist

- [ ] I updated docs/README if relevant
- [ ] I added or updated tests
- [ ] I validated Windows-specific behaviour when applicable