Zova v0.25.0

Highlights

Adds a format-9 native graph layout, opaque topology keys, edge payloads, and
atomic fresh-build APIs for high-throughput local publication while preserving
the existing public graph model.

What's changed

• Replaced repeated edge-type text in authoritative graph rows and adjacency
  indexes with a private edge-type dictionary. Public APIs still accept and
  return edge-type strings.
• Added opaque node and edge key batch mutation, lookup, keyed-neighbor,
  degree, and paged topology-scan APIs through the C ABI and raw zova-sys.
• Added atomic trusted and prepared fresh graph builds with input-aligned opaque
  keys, ordinal edge endpoints, deterministic ordering, and rollback safety.
• Added opaque edge payload storage, batch payload lookup and replacement, and
  payload-aware prepared graph construction without duplicating payload bytes
  into adjacency indexes.
• Added an atomic fresh-build session for predeclared table, FTS, graph, and
  vector targets. Graph keys can be returned provisionally for later steps in
  the same session and become durable only when the session finishes.
• Reduced fresh graph publication overhead with endpoint deduplication, dense
  endpoint slots, 256-row prepared loading, deferred index construction, and
  scoped SQLite cache tuning.
• Added fresh-build ablation and keyed-graph benchmarks plus format-8 rejection,
  transaction, fault, C/C++, generated-C, and raw Rust ABI coverage.

Compatibility

• Bumps .zova format_version from 8 to 9. Zova does not migrate
  format-8 files in place; export with a compatible format-8 build and import
  into a new format-9 database.
• Existing graph names, node IDs, edge types, traversal ordering, incremental
  APIs, and bound graph-store routing remain compatible.
• Opaque keys are database-local row identities. They are not portable public
  IDs and are invalidated when their rows or an unfinished fresh-build session
  are rolled back.
• The new opaque-key, payload, topology-scan, prepared-build, and fresh-build
  session APIs are C ABI and raw zova-sys surfaces in v0.25. The safe Rust,
  Python, and Go bindings continue to expose their existing graph APIs.

Full Changelog: v0.24.0...v0.25.0