Proposal: publish-reference-browser-image

The June-6 image-slimming change made the default reference image browser-free (the browsers Dockerfile stage was retained but its output was never wired into CI publication). Deployments that run browser-backed connectors (ChatGPT, USAA, ...) inside the reference container hit a silent hard failure at Patchright launch: "Executable doesn't exist at /opt/patchright-browsers/...". The fix took four days to diagnose because the image advertised no build-time signal that browsers were absent.

CI SHALL build and publish ghcr.io/vana-com/pdpp/reference-browser from the reference-browser Dockerfile target alongside every reference image publication. The reference-browser image extends the browsers stage and SHALL contain a working Patchright installation at PLAYWRIGHTBROWSERSPATH=/opt/patchright-browsers so that browser-backed connectors (ChatGPT, USAA, ...) can launch without a separate browser install step when running collection inside the reference container.