chore: Add CODEOWNERS, require DCO, add CONTRIBUTING

Signed-off-by: Seth Stadick <sstadick@gmail.com>

Author: sstadick

.circleci/config.yml

@@ -6,6 +6,18 @@ jobs:
       - image: cimg/base:current
     steps:
       - checkout
+      - run:
+          name: Check DCO Sign-offs
+          command: |
+            echo "🔍 Checking for Signed-off-by lines in commits..."
+            COMMITS=$(git log origin/main..HEAD --pretty=format:'%H')
+            for commit in $COMMITS; do
+              if ! git show -s --format=%B "$commit" | grep -q '^Signed-off-by:'; then
+                echo "❌ Commit $commit is missing a Signed-off-by line (git commit -s)."
+                exit 1
+              fi
+            done
+            echo "✅ All commits have Signed-off-by lines."
       - run:
           name: Install pixi CLI
           command: |

.github/CODEOWNERS

@@ -0,0 +1,3 @@
+@sstadick
+@Trecek
+@zburkett

CONTRIBUTING.md

@@ -0,0 +1,5 @@
+# Contributing
+
+- Use pull requests for all changes.
+- Sign commits with `git commit -s` to include a DCO line.
+- Add tests for new features and bug fixes.