Second broad-K0 subsystem group — two new value-typed ops reusing M1's proven
disciplines (additive: OperationKind variants 13-14, new apply arms + reduction
methods; framework frozen):
- DeleteCrossCutting { structure: TypedObjectId } — delete-wins tombstone of a
cross-cutting structure (idempotent concurrent deletes; guarded to the
Tie/Slur/Beam/Spanner kinds). Drops the transient endpoint/LWW indices so a
later event-tombstone re-anchoring pass never re-processes the deleted
structure.
- ModifyCrossCutting { structure: CrossCuttingValue } — LWW field-overwrite by
the structure's id; concurrent differing => StructuralFieldCollision. Mirrors
modify_event (resolved value lives in the graph, not MaterializedState);
re-derives endpoints from the new value, and mirrors CreateCrossCutting's
beam->=2 / endpoints-live preconditions.
Graph materialization (reduce_onto): graph_delete_cross_cutting removes the
structure by id; graph_modify_cross_cutting replaces it in place by id, across
all four kinds (Slur/Tie/Beam/Spanner). New last_cross_cutting_modify LWW map,
synced through WorkingSnapshot/snapshot/restore.
Migration: v1-native (no lossy v0 predecessor) -> project/migrate by identity;
group1_and_group2_kinds_round_trip_by_identity extended to cover them.
Coverage:
- testkit operation_payload + ops fuzz gen_payload now emit both kinds, so the
convergence / determinism / migration-equivalence gates exercise the
bookkeeping projection at scale.
- Targeted reduce_onto graph tests (tests/graph_reduction.rs) cover every kind
arm of graph_delete/graph_modify_cross_cutting (Slur/Tie/Beam/Spanner) plus
the beam->=2 reject branch of modify, with check_invariants; plus two
bookkeeping unit tests (delete tombstones; concurrent differing modify
conflicts).
Not wired into graph_edit_session (criterion 1): doing so requires creating
structures in the session, which exposes a pre-existing M1 reanchor/graph-delete
divergence (a slur whose endpoint event is deleted is re-anchored in bookkeeping
but removed from the graph). That is a separate DeleteEvent fix; the targeted
reduce_onto tests above give the M2b graph paths guaranteed coverage meanwhile.
Gates: build/fmt/clippy -D warnings clean; cargo test --workspace green (ops lib
53, ops graph_reduction 18); conformance_suite scale 1 passes. Catalog sections +
DECISIONS for these ops land in M2e per the staged plan. The unrelated Agent-I
working tree is left uncommitted; this commit stages only ops/testkit.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Levi Neuwirth
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