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feat(aligners): add backend-neutral alignment framework
- Add reusable core, data, application, benchmarking, runtime, and CLI layers
- Preserve authoritative metadata and protect source/output artifact publication
- Add deterministic transcript normalization and monotonic DP reconciliation
- Require explicit backend-owned authorization for ignorable observed alignment units
- Add lazy backend registration without introducing concrete aligner dependencies
- Enforce modular import boundaries, complete typing and documentation, and focused tests
- Achieve at least 90% per-file coverage with 99.20% aggregate Stage 1 coverage
- Record Stage 1 validation and readiness for NeMo backend implementation
