change(webauthn): WebAuthn Level 3 is a W3C Recommendation - #206
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WebAuthn Level 3 — the edition that added Related Origin Requests, and so the reason /.well-known/webauthn exists at all — reached W3C Recommendation on 25 August 2026. The page cited it as a bare /TR/ URL and called ROR "in the W3C standard", which was true but vague while Level 3 was still a working draft. Named the source as a Recommendation and said so in the prose. No date is pinned in the source title: ARIA in HTML (#177) showed that naming the current edition's date rots within weeks once a REC starts being amended. "Reached Recommendation in August 2026" is a fact that does not move. Status stays `optional`. ROR still only applies to sites running passkeys across more than one origin; a Recommendation does not widen who needs the file. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Update the WebAuthn Level 3 citation and accompanying text to reflect its W3C Recommendation status. The well-known discovery file remains optional; the audience and implementation guidance are unchanged.
Verified against the W3C Recommendation published on 25 August 2026. This is a citation correction, so no content changelog entry is added.
Validation: refreshed against current main and its dependency fixes; full site build, lint, formatting and agent-skill checks pass.