/ci:all: Full CI before PR

Runs everything in order: local tests → type check → push → pipeline URL.

One /ci:all replaces: manual tests + git push + copying the pipeline URL.

Stack detection

if [ -f "uv.lock" ]; then STACK="python"
elif [ -f "pnpm-lock.yaml" ]; then STACK="node"
elif [ -f "package-lock.json" ]; then STACK="node-npm"
elif [ -f "Cargo.toml" ]; then STACK="rust"
fi

Step 1: Local tests (blocking)