feat(lsp): call hierarchy prepare / incoming / outgoing (0.8)

Expose LSP call hierarchy over a lightweight textual call graph of
known functions and Name( call sites across the workspace.

- prepareCallHierarchy on func decl or call site
- incomingCalls / outgoingCalls with fromRanges
- smoke_lsp_call_hierarchy + test-lsp wiring

Makefile

@@ -199,6 +199,9 @@ test-lsp: lsp
 	@echo "=== LSP deeper rename smoke ==="
 	@chmod +x tools/smoke_lsp_rename_deep.sh
 	@tools/smoke_lsp_rename_deep.sh
+	@echo "=== LSP call hierarchy smoke ==="
+	@chmod +x tools/smoke_lsp_call_hierarchy.sh
+	@tools/smoke_lsp_call_hierarchy.sh
 
 .PHONY: test-registry
 test-registry: build