docs: xvfb claims match CI evidence — run headless in CI#4
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…run headless The 24-bit-xvfb suggestion implied a verified fix; in CI it failed silently. State the evidence instead: 8-bit breaks Page.captureScreenshot, 24-bit still failed — use headless in CI (the starter's capture.yml is now headless-only).
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Follow-up to the verification dispatches: the 24-bit-xvfb suggestion implied a verified fix, but in CI it failed silently. Docs now state the evidence (8-bit breaks
Page.captureScreenshot; 24-bit still failed; headed-under-xvfb unsupported on runners — run headless). Matches the starter's now headless-onlycapture.yml.