ocs_doc_api: update docs + fix review-drift findings

- lib.rs: export all 14 facade handles (add ArcCurve/Ellipse/Spline/Ray/XLine/Text/
  MText/Dimension + Circle) — public surface matches collection return types.
- build.rs: fix step-1 comment (enums are hand-maintained, not 'regenerated');
  generic_reference_md: Clone (not Copy) + full 14-handle list (was stale 6).
- ops.rs/query.rs: correct 'hand-maintained' module doc comments (were 'GENERATED').
- layouts.json: extend to all 22 Operation + 12 Query variants (was stale phase-1).
- binding_schema.json regenerated (complete layouts + derived handles).
- generate.py: inject 'id': self.id for SetTextContent/SetAttribute/SetViewportView/
  Transform/Delete/AddVertex (was malformed id-less payloads); _apply_op/_apply_query
  accept want=None; extend PY_TYPES (String/&str/Vec returns/new handles).
- README.md: Clone (not Copy) + full scope (2D curves, annotations, containers,
  viewports, media) replacing stale 'Not yet' list.
- Plan (.kilo): mark implemented & published; pointer to live crate docs.

crates/ocs_doc_api/src/gen/api_reference.md

@@ -178,8 +178,9 @@ Table (read-only): GetEntity kind; generic delete. No typed create/bounds in v1.
 
 ## Generic methods (every handle)
 
-Every typed handle (`Solid`, `Line`, `Circle`, `Polyline`, `Point`, `Entity`) is a
-`Copy`, `Send`, `Sync` token `{ ObjectId, session }` and supports:
+Every typed handle (`Solid`, `Line`, `Circle`, `Polyline`, `Point`, `ArcCurve`,
+`Ellipse`, `Spline`, `Ray`, `XLine`, `Text`, `MText`, `Dimension`, `Entity`) is a
+`Clone`, `Send`, `Sync` token `{ ObjectId, session }` and supports:
 
 - **`id()` -> `ObjectId`** — the stable entity identity.
 - **`bounds()` -> `Aabb`** — coarse bounding box (solids lift-on-miss; 2D entities