Folds the three open PLAN_GENESIS_OPS.md §6 rulings, ratified 2026-07-29:
1. Deletes: mints only, all five deferred out of G3. The former "live
dependents -> container-not-empty" sentence is superseded outright --
ContainerNotEmpty concerns owned children (effect.rs:156), while the G3
hazard is dangling inbound references from independently-live objects,
which would need a new typed reason and its own epoch.
2. decomposition_attachments: derived, not authored.
3. Measure.time_signature: resolution-plus-agreement. An optional explicit
declaration at the measure start, neither an override of the metric grid
nor a cache of it. Invariant 20 (G3b) covers agreement and boundary
consistency only, not reference resolution.
G3 splits: G3a (four root-level mints, kinds/tags 35-38, epoch 11, all
schema major 0) and G3b (CreateMeasure, kind/tag 39, epoch 12, carrying
invariant 20 and a new precondition reason at discriminant 16).
Correction of record: an earlier scoping claimed invariant 10 "covers
cross-cutting refs, not this". False -- read off the variant's doc comment
rather than the check body. Invariant 10 already resolves a staff's group, a
group's members, a part's staves, a view's active layers, and measure and
grid time-signature references (invariants.rs:1122-1156, :1180-1212), tested
at :3596. Its doc comment names none of them, so G3a owes a prose
reconciliation and no enum entry.
Also corrects five drifted citations that a touch table exists to prevent:
reduce.rs 3850->4075 and 2342->2559, barriers.rs 437->313, barrier.rs
1105->1156, text_projection_grammar.rs 307->315; and "five siblings" ->
"four siblings" now that CreateMeasure is its own packet.
Verified against the tree, not assumed: all four carried types are schema
major 0 (no versioned walk exists; both decode_v0_score and the live walk
read them through plain Codec::dec), TypedObjectId already carries all five
variants, and struct_codec! generates TextValue as well as Codec -- so G3a
moves no wire bound, appends no typed id, and needs no textvalue_graph.rs
work. It does close a live defect: every G3 object kind becomes Live only
through base ingest, so CreateStaff's group precondition is currently
unsatisfiable under from-empty reduction.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QjsEnYhm1gPpf6ii2iFxFV
Levi Neuwirth
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