feat(lsp): method, type, and self-receiver rename (0.10)

Add rtkMethod so .Method( call sites rename with the method decl, improve
type renames across extend/annotations, and clip self to the enclosing
method body.

- Len→Length includes self.Len(); Point→Vec2 hits extend + types
- self→this stays within one method (textual func bounds)
- smoke_lsp_rename_method + test-lsp wiring

Makefile

@@ -205,6 +205,9 @@ test-lsp: lsp
 	@echo "=== LSP method call hierarchy smoke ==="
 	@chmod +x tools/smoke_lsp_method_hierarchy.sh
 	@tools/smoke_lsp_method_hierarchy.sh
+	@echo "=== LSP method/type/receiver rename smoke ==="
+	@chmod +x tools/smoke_lsp_rename_method.sh
+	@tools/smoke_lsp_rename_method.sh
 
 .PHONY: test-registry
 test-registry: build