ADR-CE-017: Unified Audit Trail

Status: Accepted Date: 2026-01-22 Parent: ADR-014 Coherence Engine Architecture

Context

RuvLLM has WitnessLog for inference audit. Prime-Radiant has WitnessRecord for coherence decisions. Two separate audit trails create:

Fragmented compliance story
Difficult cross-referencing
Duplicate storage

Decision

WitnessLog and Prime-Radiant governance share single audit trail.

Unified structure:

pub struct UnifiedWitnessLog {
    coherence_witnesses: Vec<WitnessRecord>,
    inference_witnesses: WitnessLog,
}

pub struct GenerationWitness {
    inference: InferenceWitness,
    coherence: WitnessRecord,
    hash_chain: Hash,
}

Every LLM generation links:

Inference witness (what was generated)
Coherence witness (why it was allowed)
Hash chain (tamper-evident ordering)

Consequences

Benefits

Single audit trail for compliance
Cross-reference inference ↔ coherence decisions
Reduced storage (shared chain)

Risks

Migration from two systems to one
Both systems must agree on witness format

References

ADR-014: Coherence Engine Architecture, "RuvLLM Integration"
ADR-CE-005: First-Class Governance Objects

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