feat: grlx LSP server in Go

LSP server for grlx recipe files (.grlx) providing:

- Completion for ingredients, methods, properties, requisite types,
  and step ID references
- Diagnostics for unknown ingredients/methods, missing required
  properties, unknown properties, and invalid requisite types
- Hover documentation for all ingredients and methods with property
  tables
- Full schema for all 6 grlx ingredients (cmd, file, group, pkg,
  service, user) with accurate properties from the grlx source

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+      - run: go build ./...
+      - run: go test -race ./...
+      - run: go vet ./...
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+      - run: go install honnef.co/go/tools/cmd/staticcheck@latest
+      - run: staticcheck ./...