merge: sync upstream kickstart changes (treesitter indent fallback)

- Keep local treesitter parser list (go, python, ts, sql, docker, etc.)
- Take upstream's has_indent_query guard (PR nvim-lua#1988 bug fix)
- Keep local lint.lua (markdownlint-cli2 + golangcilint)
- Auto-merged: neo-tree filtered_items removal, gitsigns comment update,
  treesitter auto-install on file open

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Author: AIMacGyver

init.lua

@@ -939,8 +939,17 @@ require('lazy').setup({
         -- enables syntax highlighting and other treesitter features
         vim.treesitter.start(buf, language)
 
+        -- enables treesitter based folds
+        -- for more info on folds see `:help folds`
+        -- vim.wo.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
+        -- vim.wo.foldmethod = 'expr'
+
+        -- check if treesitter indentation is available for this language, and if so enable it
+        -- in case there is no indent query, the indentexpr will fallback to the vim's built in one
+        local has_indent_query = vim.treesitter.query.get(language, 'indent') ~= nil
+
         -- enables treesitter based indentation
-        vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
+        if has_indent_query then vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()" end
       end
 
       local available_parsers = require('nvim-treesitter').get_available()