Add SVG viz, test helpers, and makegen scaffold

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+# Generated by gunbc - minimal YAML shim
+# All CI logic is in testable Rust code, not YAML
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-action@stable
+
+      - name: Run CI
+        run: cargo run -p gunbc-ci -- run

.gitignore

@@ -1,18 +1,27 @@
-# Cargo build artifacts — reproducible from source
+# Generated by gunbc-bootstrap
+
+# Rust
 /target/
+**/*.rs.bk
+Cargo.lock
 
-# Editor/IDE state
+# IDE
 .idea/
 .vscode/
 *.swp
 *.swo
 *~
 
-# OS metadata
+# OS
 .DS_Store
 Thumbs.db
 
-# Secrets / local config
-.env
-.env.local
-.env.*.local
+# Build artifacts
+*.o
+*.a
+*.so
+*.dylib
+
+# Generated files (keep these tracked)
+# Makefile
+# .github/workflows/ci.yml