ogar-fma-skeleton: FMA skeletal spine as the clamped convergence anchor

Operator directive (2026-06-23): "FMA is a must... bones not being
negotiable... hardcoded hand-optimized convergence optimization" +
"project ViT or X-ray and especially ultrasound × Doppler". The two
requirements are one constraint: bones must be hardcoded and stable
BECAUSE they are the cross-modal registration frame every modality
projects onto.

New crate `ogar-fma-skeleton`:
- morton.rs: the 2bit×2bit 4×4 Morton-tile pyramid. Uniform 16×8-bit
  (16-byte) family-node key — never a 12+4 carve (the operator
  correction: a heterogeneous carve breaks the uniform Morton stride
  and loses the perturbation-shader data). Each nibble = one 4×4 tile
  (X/Y interleaved); 32 levels; tier = level>>2. assign_morton_suffixes
  descends the sibling quadtree so prefix = spatial = partonomy.
- lib.rs: hand-curated atlas (~80 nodes: full vertebral column C1–coccyx,
  skull, sternum, 12 rib pairs, major appendicular bones per side).
  Each bone's 16-byte address is DERIVED from its rest-pose centroid, so
  parent.is_ancestor_of(child) holds AND laterality lives in the X-tile.
  Bones are clamped Dirichlet anchors by definition (no un-clamped bone).
  16 tests: tree integrity, prefix=partonomy=spatial containment, unique
  node keys, clamped-anchor invariant, unit-quaternion frames, laterality,
  address stability.

ogar-vocab: new ConceptDomain::Anatomy (0x0A) — anatomical_structure /
skeleton / bone / joint (0x0A01..04). Anatomy is public reference, not
PHI, so it gets its own domain (not Health 0x09, which would drag it into
medcare's fail-closed RBAC set). The ~206 bones are cascade-path nodes
under the `bone` concept, not codebook slots (FMA = the Wikidata-HHTL
pattern: the hierarchy lives in the path).

docs/FMA-SKELETON-CONVERGENCE-ANCHOR.md + DISCOVERY-MAP D-FMA-SKELETON.
Address structure CODED (16 tests); splat-fit convergence CONJECTURE,
gated on the splat-native arc (SPLAT-NATIVE-CUSTOMER.md §6 litmus).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EYvNjD8M8LMNYbRy3gq2FP

Author: claude

Cargo.toml

@@ -16,6 +16,7 @@ members = [
     "crates/ogar-from-schema",
     "crates/ogar-class-view",
     "crates/ogar-render-askama",
+    "crates/ogar-fma-skeleton",
 ]
 
 [workspace.package]

crates/ogar-fma-skeleton/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "ogar-fma-skeleton"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+authors.workspace = true
+rust-version.workspace = true
+description = "FMA skeletal spine — the hand-curated, clamped convergence-anchor atlas: bones as immutable 16×8-bit Morton-tile family-node addresses (partonomy = spatial prefix), the rigid reference frame every imaging modality (ViT / X-ray / ultrasound × Doppler) registers against."
+
+[features]
+default = []
+serde = ["dep:serde", "ogar-vocab/serde"]
+
+[dependencies]
+ogar-vocab = { path = "../ogar-vocab" }
+serde = { workspace = true, optional = true }