fix: root Claude Code lua_ls at ~/.config/nvim

- lua-lsp rooted lua_ls at $HOME: ignored .luarc.json, flooded
  'Undefined global vim', no IntelliSense on the nvim config.
- New local marketplace/plugin lua-lsp-local@local-lsp: .lsp.json sets
  workspaceFolder=~/.config/nvim, Neovim runtime as workspace.library,
  diagnostics.libraryFiles=Disable.
- Disable official lua-lsp (enabledPlugins) so one server owns .lua.
- Verified by probe: rootUri now file:///home/tvanbesi/.config/nvim,
  flood gone.
- Annotate the intentional open_floating_preview monkey-patch
  (clears the now-correct duplicate-set-field).
- README: validate/add/install/disable repro + plugin-update workflow.

1 files changed, 13 insertions, 0 deletions

diff --git a/.claude/lsp-marketplace/.claude-plugin/marketplace.json b/.claude/lsp-marketplace/.claude-plugin/marketplace.json
new file mode 100644
index 0000000..4821b64
--- /dev/null
+++ b/.claude/lsp-marketplace/.claude-plugin/marketplace.json
@@ -0,0 +1,13 @@
+{
+  "name": "local-lsp",
+  "owner": {
+    "name": "tvanbesi"
+  },
+  "plugins": [
+    {
+      "name": "lua-lsp-local",
+      "source": "./plugins/lua-lsp-local",
+      "description": "lua-language-server rooted at the Neovim config, with the Neovim runtime as library"
+    }
+  ]
+}