chore: Remove CI workflow

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -1,29 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches: [ main, master ]
-  pull_request:
-    branches: [ main, master ]
-
-env:
-  CARGO_TERM_COLOR: always
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Build
-      run: cargo build --verbose
-
-    - name: Run tests
-      run: cargo test --verbose
-
-    - name: Check formatting
-      run: cargo fmt -- --check
-
-    - name: Run clippy
-      run: cargo clippy -- -D warnings