ci: add GitHub Actions workflow for lint and format checks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: SpollaL

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    name: Lint (luacheck)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install luacheck
+        run: sudo apt-get install -y luacheck
+
+      - name: Run luacheck
+        run: luacheck lua/ plugin/
+
+  format:
+    name: Format (stylua)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install stylua
+        uses: JohnnyMorganz/stylua-action@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: latest
+          args: --check lua/ plugin/

.luacheckrc

@@ -0,0 +1,8 @@
+-- Globals provided by Neovim
+globals = { "vim" }
+
+-- Don't complain about line length (stylua handles formatting)
+max_line_length = false
+
+-- Ignore warnings about unused loop variables named "_"
+unused_args = false

stylua.toml

@@ -0,0 +1,5 @@
+column_width = 120
+line_endings = "Unix"
+indent_type = "Spaces"
+indent_width = 2
+quote_style = "AutoPreferDouble"