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

tools/smoke_lsp_rename.sh

@@ -59,7 +59,7 @@ if ! grep -q 'renameProvider' "$TMP/out.txt"; then
   echo "FAIL: initialize missing renameProvider"
   exit 1
 fi
-if ! grep -qE '0\.[56]\.0' "$TMP/out.txt"; then
+if ! grep -qE '0\.[567]\.0' "$TMP/out.txt"; then
   echo "WARN: unexpected bux-lsp version in initialize"
 fi