lspconfig root detection not fixed, workaround noted

lua/plugins/lsp.lua

@@ -49,6 +49,17 @@ return {
     setup("jsonls")
     setup("bashls")
     setup("marksman")
-    setup("intelephense")
+    -- TODO(r): Root detection can pick a parent repo in nested setups.
+    -- Workaround noted in MIGRATION_PLAN.md: create an empty `.git` (or `.nvimroot`)
+    -- in the intended workspace root to pin LSP root until we refine root_dir further.
+    setup("intelephense", {
+      single_file_support = false,
+      root_dir = util.root_pattern(
+        ".neoconf.json",
+        "composer.json",
+        ".nvimroot",
+        ".git"
+      ),
+    })
   end,
 }