feat(mcp): declarative op table and per-variant request validation

- Define Ty, Param, Rule, and OpDef in src/mcp_ops.rs for all 39 mutations
- Generate Draft 2020-12 schema using per-op anyOf variants with op enum discriminators
- Disambiguate colliding properties (replace, center, name) across mutation variants
- Add pre-dispatch validator enforcing required fields, rules, and parameter types
- Emit unknown parameter warnings into response warnings
- Introduce target_document_id for entities_copy_to with deprecated document_id fallback
- Update unit tests and automation smoke assertions

src/lib.rs

@@ -15,6 +15,8 @@ pub(crate) mod input;
 pub mod io;
 #[cfg(not(target_arch = "wasm32"))]
 pub mod mcp;
+#[cfg(not(target_arch = "wasm32"))]
+pub mod mcp_ops;
 pub mod modules;
 #[cfg(not(target_arch = "wasm32"))]
 pub(crate) mod network;