feat(scoring): add governed enterprise issue evidence adapters

[seonghobae]

Summary

• add provider-neutral, immutable enterprise source, evidence-span, atomic-issue, counterevidence, stakeholder-perspective, and candidate-intervention contracts under fast_mlsirm.scoring.enterprise_issue
• preserve direct facts, supported inferences, counterevidence, unresolved ambiguity, and stakeholder value judgments as distinct epistemic roles
• compile exact source spans into the existing shared EvidenceReference boundary without introducing a parallel scoring schema
• reject undeclared source revisions, mismatched counterevidence, sensitive raw-text metadata, duplicate evidence, and nondeterministic input ordering
• add deterministic tests, buyer-facing interpretation boundaries, APA 7th references, and authoritative changelog material

Boundary

This slice performs no scoring, calibration, sentiment analysis, ranking, utility arithmetic, causal estimation, or high-stakes automation. Candidate interventions remain caller-supplied hypotheses. The next slice can add deterministic explicit-value parsing and shared ScoringRequest compilation over these contracts.

Advances #404

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📥 Commits

Reviewing files that changed from the base of the PR and between f6d2964 and 7a7a628.

📒 Files selected for processing (6)

• CHANGELOG.md
• docs/changelog.d/enterprise-issue-evidence-contracts.md
• docs/enterprise_issue_evidence_contracts.md
• python/fast_mlsirm/scoring/enterprise_issue/__init__.py
• python/fast_mlsirm/scoring/enterprise_issue/contracts.py
• tests/test_scoring_enterprise_issue_contracts.py

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