pub const LOG_SCHEMA_VERSION: &str = "v2";Expand description
Provenance-log row schema version this build writes
(docs/PROVENANCE_LOG.md §3, ADR-0024).
Bumped from "v1" (implicit; pre-Slice-4 rows had no
schema_version field) to "v2" when the canonical_digest column
landed. The v1→v2 migration is one-shot, idempotent, and dry-runnable
via migrate_v1_to_v2.