Add obligation refinement pipeline between Pass 0a and 0b:
- Merge pass: rule-based dedup of implementation-level duplicate obligations
within the same parent control (Jaccard similarity on action+object)
- Enrich pass: classify trigger_type (event/periodic/continuous) and detect
is_implementation_specific from obligation text (regex-based, no LLM)
- Pass 0b: skip merged obligations, cap severity for impl-specific, override
category to 'testing' for test obligations
- Migration 075: merged_into_id, trigger_type, is_implementation_specific
- Two new API endpoints: merge-obligations, enrich-obligations
- 30+ new tests (122 total, all passing)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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