Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.
RFC 10024 hybrids (X25519MLKEM768 etc.) are deployed by default across Chrome, Firefox, Cloudflare and CDNs since 2024-2026 — harvest-now-decrypt-later is being retired at the protocol level. Verify your stacks support it.