Consume semantic graph state for SourceOS object actor schema provenance sync

[mdheller]

Context

SocioProphet/sociosphere now contains docs/integrations/hellgraph-semantic-governance-control-loop-v0.md.

SourceOS syncd should consume the semantic-governance graph as the object/actor/schema/provenance substrate for local-first state integrity.

Required v0 integration

Define how sourceos-syncd consumes graph-backed semantic state for:

• object identity,
• actor identity,
• schema/profile identity,
• provenance hashes,
• policy binding refs,
• quality/evidence refs,
• replay/receipt refs,
• repair and reconciliation decisions.

Mandatory edge awareness

The daemon should be able to treat these edge classes as sync-relevant state:

• lg:represents
• lg:derivedFrom
• lg:conformsTo
• lg:governedBy
• lg:hasQualitySignal

Acceptance criteria

• A SourceOS object can carry semantic graph references without embedding the entire graph.
• Policy and provenance references survive local-first sync/replay.
• Missing or stale graph references are detectable as repair conditions.
• Integration remains consumer-side; HellGraph remains graph authority.
• SourceOS product overlays consume semantics without mutating clean upstream mirrors such as librewolf-source-mirror.

Non-goals

• Do not make sourceos-syncd a graph database.
• Do not put SourceOS product changes into clean upstream mirror repos.