Replace the reconstructed test_dse_agent.py with the canonical version and add
the companion unit tests (classification_gate, embedding_recall) covering the
recovered v3 modules. Include the curated DSE criteria backup + changelog
(legal-note rationale per control), the v1 validation writeup, and the
multi-company DSE ground-truth fulltexts (elli/eto/mercedes/safetykon) used
for threshold calibration.
18 DSE tests green offline (DB/embedding/LLM stubbed).
dev-only, no deploy.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>