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feat(readiness): add W1-T semantic timing proxy
- Add backend-neutral semantic-readiness timing extraction and cross-aligner consensus
- Add deterministic W1-token to lexical-alignment mapping with explicit uncertainty handling
- Add reuse-first NeMo, MFA, and WhisperX evidence validation and provenance checks
- Add CLI and application workflows for offline-only semantic-readiness timing
- Add runtime-isolation, architecture, token-mapping, consensus, and coverage tests
- Document the provisional non-human-measured W1-T evaluation contract
