redirect-sentinel v1.0.0

• First release: open redirect and mixed content finder for build directories and live crawls, with 13 rules: active/passive mixed content, insecure forms and links, client-side open redirects, open redirect rules in Netlify/Vercel/nginx/Apache configs, redirect parameters, meta refresh, HTTPS downgrades, long chains, missing HTTP→HTTPS redirect, and opt-in safe probing with a .invalid canary.
• Text, JSON, SARIF and Markdown output; allowlist with expiry; per-rule severity; --fail-on; composite GitHub Action.