chore: update project configs to match cp.nvim

- Add .editorconfig
- Add .luarc.json for LSP support
- Rename .stylua.toml to stylua.toml
- Update .gitignore

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+insert_final_newline = true
+charset = utf-8
+
+[*.lua]
+indent_style = space
+indent_size = 2

.gitignore

@@ -1,3 +1,5 @@
 doc/tags
-vim.toml
-selene.toml
+.*cache*
+CLAUDE.md
+.claude/
+node_modules/

.luarc.json

@@ -0,0 +1,8 @@
+{
+  "runtime.version": "Lua 5.1",
+  "runtime.path": ["lua/?.lua", "lua/?/init.lua"],
+  "diagnostics.globals": ["vim"],
+  "workspace.library": ["$VIMRUNTIME/lua", "${3rd}/luv/library"],
+  "workspace.checkThirdParty": false,
+  "completion.callSnippet": "Replace"
+}

.stylua.toml

@@ -1,4 +0,0 @@
-quote_style = "AutoPreferSingle"
-call_parentheses = "None"
-indent_type = "Spaces"
-column_width = 80

stylua.toml

@@ -0,0 +1,8 @@
+column_width = 100
+line_endings = "Unix"
+indent_type = "Spaces"
+indent_width = 2
+quote_style = "AutoPreferSingle"
+call_parentheses = "Always"
+[sort_requires]
+enabled = true