v0.3.2: serve, k8s, cloud, studio

Headless plus server plus UI, all installable with no clone:

pipx install shadowbox==0.3.2
shadowbox init --out demo

New since v0.3.1: serve command for the local API, Kubernetes manifest importer with format autodetect, D1Store plus injectable app factory (Cloudflare Worker live), permissive CORS for browser clients, stratified replay sampling, React plus Cytoscape Studio (also live on Pages), PyPI classifiers plus README badges.

Verified: 46 pytest green, strict mypy plus ruff clean, CI green on tag, clean PyPI install simulates the golden card identically (5000/6000 ok, p99 34ms).