chore: add typos spell checker configuration

- Add typos.toml configuration file
- Add typos CI job to workflow
- Add typos and typos-lsp to flake.nix devShell
- Enable typos in treefmt
- Add just typos command

Author: ryoppippi

.github/workflows/ci.yml

@@ -14,6 +14,18 @@ permissions:
   contents: read
 
 jobs:
+  typos:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Setup Nix
+        uses: ./.github/actions/setup-nix
+
+      - name: Run Typo Check
+        run: nix develop --command typos .
+
   ci:
     runs-on: ubuntu-latest
     strategy:

flake.nix

@@ -54,6 +54,7 @@
                   "CHANGELOG.md"
                 ];
               };
+              typos.enable = true;
             };
           };
 
@@ -81,6 +82,8 @@
               uv
               just
               nixfmt-rfc-style
+              typos
+              typos-lsp
             ];
 
             shellHook = ''

justfile

@@ -25,3 +25,7 @@ test-examples:
 # Run type checking
 mypy:
 	uv run mypy stackone_ai
+
+# Run typos spell checker
+typos:
+	typos .

typos.toml

@@ -0,0 +1,15 @@
+[default]
+locale = 'en-us'
+extend-ignore-re = [
+  "(?s)(#|//)\\s*spellchecker:off.*?\\n\\s*(#|//)\\s*spellchecker:on",
+  "(?s)<!--\\s*spellchecker:off.*?\\n\\s*spellchecker:on\\s*-->",
+  "(?Rm)^.*#\\s*spellchecker:disable-line$",
+  "(?m)^.*<!--\\s*spellchecker:disable-line\\s*-->\\n.*$"
+]
+
+[files]
+extend-exclude = [
+  ".venv",
+  "uv.lock",
+  "CHANGELOG.md",
+]