ocs_doc_api: fix review findings (scale/rotation/all-or-nothing/DoS/bounds/codegen)

CRITICAL:
- transform_entity_geometry: fix s^2 double-scale (axes already carry scale; drop
  the *s pre-multiply so 2D entities scale by s like solids), and handle rotation
  for direction/angle fields (apply_dir for Ray/XLine direction + Ellipse
  major_axis; offset Arc angles; compose Insert rotation).
- ensure_transformable: check layer-lock + resolve solid bodies (not just type),
  restoring TransformMany all-or-nothing; regression test with a locked layer.

WARNING:
- volume/centroid: memoize per (handle, geometry_epoch) + cap cold-cache
  tessellation budget (query-batch DoS).
- entity_to_profile_curves: fail Unsupported on polyline bulge (no silent
  chord-substituted sweep profile).
- Ellipse: validate minor_axis_ratio in (0,1] so bounds never under-bound.
- RasterImage bounds: bracket all four corners (rotated/flipped images).

SUGGESTION:
- binding_schema.json handles derived from spec families (includes ArcCurve/
  Ellipse/Spline/Ray/XLine).
- build.rs header: enums are hand-maintained (not 'GENERATED'); ops_gen/query_gen
  headers corrected to match.
- Dedupe divergence mesh_volume_centroid into the crate's geom module; host +
  both mocks delegate.

Tests: +3 regression tests (scale-once, rotation, locked-layer all-or-nothing)
-> 604 host lib green; 8 crate unit tests green.

crates/ocs_doc_api/src/gen/binding_schema.json

@@ -265,7 +265,12 @@
       "Line",
       "Circle",
       "Polyline",
-      "Point"
+      "Point",
+      "ArcCurve",
+      "Ellipse",
+      "Spline",
+      "Ray",
+      "XLine"
     ],
     "root": "DocApi"
   },

crates/ocs_doc_api/src/gen/ops_gen.rs

@@ -1,7 +1,8 @@
-// GENERATED by build.rs from spec/entities.toml — do NOT edit by hand.
-// Committed snapshot for reviewability (plan §10); build.rs regenerates and CI
-// fails on drift (`--check`). Append new variants at the END only (bincode
-// discriminant stability, plan §7).
+// HAND-MAINTAINED wire vocabulary (the Operation enum). This file is NOT derived
+// from spec/entities.toml by build.rs — the enum is the canonical append-only
+// wire vocabulary; the spec's `op` names must each map to a variant here
+// (enforced by a test). Append new variants at the END only (bincode discriminant
+// stability, plan §7). Do NOT reorder or remove variants.
 
 use serde::{Deserialize, Serialize};
 

crates/ocs_doc_api/src/gen/query_gen.rs

@@ -1,7 +1,7 @@
-// GENERATED by build.rs from spec/entities.toml — do NOT edit by hand.
-// Committed snapshot for reviewability (plan §10); build.rs regenerates and CI
-// fails on drift (`--check`). Append new variants at the END only (bincode
-// discriminant stability, plan §7).
+// HAND-MAINTAINED wire vocabulary (the Query enum). NOT derived from the spec by
+// build.rs — the enum is the canonical append-only wire vocabulary; the spec's
+// `query` names must each map to a variant here (enforced by a test). Append new
+// variants at the END only (bincode discriminant stability, plan §7).
 
 use serde::{Deserialize, Serialize};
 

crates/ocs_doc_api/src/geom.rs

@@ -13,6 +13,31 @@ fn geom_err(kind: GeometryErrorKind, msg: impl Into<String>) -> ApiError {
     ApiError::geometry(kind, msg)
 }
 
+/// Signed volume and centroid of a closed triangle mesh via the divergence
+/// theorem: V = Σ v0·(v1×v2)/6, C = Σ (v0+v1+v2)·tetra_vol / (4V). Single source
+/// of truth shared by the host backend and the test/example mock backends.
+pub fn mesh_volume_centroid(mesh: &cadkernel::brep::Mesh) -> (f64, [f64; 3]) {
+    let mut vol = 0.0;
+    let mut c = [0.0; 3];
+    for t in &mesh.triangles {
+        let (v0, v1, v2) = (mesh.positions[t[0]], mesh.positions[t[1]], mesh.positions[t[2]]);
+        let cross = [
+            v1[1] * v2[2] - v1[2] * v2[1],
+            v1[2] * v2[0] - v1[0] * v2[2],
+            v1[0] * v2[1] - v1[1] * v2[0],
+        ];
+        let tet = (v0[0] * cross[0] + v0[1] * cross[1] + v0[2] * cross[2]) / 6.0;
+        vol += tet;
+        for i in 0..3 {
+            c[i] += (v0[i] + v1[i] + v2[i]) * tet;
+        }
+    }
+    if vol.abs() < 1e-12 {
+        return (0.0, [0.0; 3]);
+    }
+    (vol, [c[0] / (4.0 * vol), c[1] / (4.0 * vol), c[2] / (4.0 * vol)])
+}
+
 /// The XY work plane (origin at 0, X=(1,0,0), normal=(0,0,1)).
 fn xy_plane() -> ApiResult<Plane> {
     Plane::orthonormal([0.0, 0.0, 0.0], [1.0, 0.0, 0.0], [0.0, 0.0, 1.0])