feat(lsp): deeper rename for fields, variants, qualified paths

bux-lsp 0.7 indexes struct fields and enum variants and renames only the
right binding: .member / ::Variant / field-init, without clobbering locals.

- Member scan in analyzeFile; access kinds bare/dot/colon/field-init
- classifyRenameTarget: local | member | global
- smoke_lsp_rename_deep + test-lsp wiring

Makefile

@@ -196,6 +196,9 @@ test-lsp: lsp
 	@echo "=== LSP workspace/symbol smoke ==="
 	@chmod +x tools/smoke_lsp_workspace.sh
 	@tools/smoke_lsp_workspace.sh
+	@echo "=== LSP deeper rename smoke ==="
+	@chmod +x tools/smoke_lsp_rename_deep.sh
+	@tools/smoke_lsp_rename_deep.sh
 
 .PHONY: test-registry
 test-registry: build