Consistency checking for the canonical session store.

This is a read/integrity surface over SQLite rows, BlobStore bytes, and the
derived Datahike index. It does not participate in runtime writes.

Derived Datalog index over canonical SQLite transaction batches.

Runtime correctness does not depend on this namespace. It is the query index:
useful, rebuildable, and intentionally downstream of SQLite rows plus blob
identities.

Small filesystem/EDN helpers used by store backends.

This namespace is intentionally dumb: it knows nothing about sessions, heads,
invocations, or indexes.

Canonical payload byte storage.

Facts identify payloads; BlobStore owns their bytes. This namespace is the
small seam between fact rows and content-addressed payload refs.

Datahike schema for the derived session index.

SQLite rows remain the canonical hot store; this schema describes the
rebuildable query index over those rows and blob identities.

Pure store-facing value helpers.

These functions build identities, lookup refs, summaries, and scalar facts.
They do not write storage and do not know about runtime sessions.