お客様を1秒も待たせない「0.4秒表示」の心地よさ：
Zero-JS静的配信とAI検索（GEO/AEO）のしくみ

# ============================================================================
# 1. ap01.ok.st Edge Nginx Configuration — HTTP/3 QUIC + Static Brotli-11
# ============================================================================
# listen 443 quic reuseport;
# listen 443 ssl;
# http2 on;
# ssl_protocols TLSv1.3;
# ssl_early_data on; # TLS 1.3 0-RTT for idempotent GET requests
# add_header Alt-Svc 'h3=":443"; ma=86400' always;
# brotli_static on;
# gzip_static on;

// ============================================================================
// 2. Rust 2024: Core Web Vitals (LCP / TBT / CLS) Compile-Time Budget Enforcer
// ============================================================================
#![forbid(unsafe_code)]

#[derive(Clone, Copy, Debug)]
pub struct NavigationTimingTrace {
    pub ttfb_ms: u32,
    pub fcp_ms: u32,
    pub lcp_ms: u32,
    pub main_thread_tasks_ms: &'static [u32],
    pub cls_milli: u32, // CLS * 1000 (e.g. 0 == 0.000)
}

impl NavigationTimingTrace {
    /// Computes Total Blocking Time (TBT): sum of (task_duration - 50ms) for all tasks > 50ms
    pub const fn compute_tbt_ms(&self) -> u32 {
        let mut tbt = 0u32;
        let mut i = 0;
        while i < self.main_thread_tasks_ms.len() {
            let d = self.main_thread_tasks_ms[i];
            if d > 50 {
                tbt += d - 50;
            }
            i += 1;
        }
        tbt
    }

    /// Enforces Open Knowledge Zero-JS SLA:
    /// TTFB <= 200ms, LCP <= 800ms, TBT == 0ms, CLS == 0.000
    pub const fn passes_ok_2026_sla(&self) -> bool {
        self.ttfb_ms <= 200
            && self.lcp_ms <= 800
            && self.compute_tbt_ms() == 0
            && self.cls_milli == 0
    }
}