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205 lines
16 KiB
HTML
205 lines
16 KiB
HTML
<!doctype html>
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<html lang="en"><meta charset="utf-8">
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<meta name="policy-source-revision" content="883533ed8af1703cc9bb4a2b24137e325bbbda47">
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<meta name="policy-source-digest" content="e02982ce54691cf1589ac3d04012b9b9282f9eb54ed4b8f2f0544371f9b87f3e">
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<title>Derived Rail Composition</title>
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<style>
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:root{
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--paper:#EDEEF0; --surface:#F6F7F8; --surface-2:#E4E6E9;
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--ink:#171D24; --ink-2:#4A5561; --ink-3:#737E8A;
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--rule:#D3D7DC; --rule-strong:#B6BCC3;
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--brass:#8A6A2E; --brass-soft:#EFE5CD; --brass-line:#C9AE74;
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--clay:#8A3A2C; --clay-soft:#F2DFDA;
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--l0:#DCE0E2; --l1:#B9C4C7; --l2:#8CA1A6; --l3:#567D84; --l4:#23555E;
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--chip-fg:#F6F7F8;
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--font-display:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
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--font-body:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
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--font-mono:ui-monospace,"SF Mono","Cascadia Code",Menlo,Consolas,monospace;
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--measure:66ch;
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}
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@media (prefers-color-scheme:dark){
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:root:not([data-theme="light"]){
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--paper:#12161A; --surface:#191E24; --surface-2:#222831;
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--ink:#E6E9EC; --ink-2:#A3ADB7; --ink-3:#78838E;
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--rule:#2A3138; --rule-strong:#3B444D;
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--brass:#C9A45C; --brass-soft:#33290F; --brass-line:#6B5426;
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--clay:#D08A76; --clay-soft:#3A211B;
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--l0:#262C32; --l1:#35424A; --l2:#4A626B; --l3:#6A939D; --l4:#97C4CD;
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--chip-fg:#12161A;
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}
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}
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:root[data-theme="dark"]{
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--paper:#12161A; --surface:#191E24; --surface-2:#222831;
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--ink:#E6E9EC; --ink-2:#A3ADB7; --ink-3:#78838E;
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--rule:#2A3138; --rule-strong:#3B444D;
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--brass:#C9A45C; --brass-soft:#33290F; --brass-line:#6B5426;
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--clay:#D08A76; --clay-soft:#3A211B;
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--l0:#262C32; --l1:#35424A; --l2:#4A626B; --l3:#6A939D; --l4:#97C4CD;
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--chip-fg:#12161A;
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}
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*{box-sizing:border-box}
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body{
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margin:0; background:var(--paper); color:var(--ink);
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font-family:var(--font-body); font-size:17px; line-height:1.62;
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-webkit-font-smoothing:antialiased;
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}
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.wrap{max-width:1180px;margin:0 auto;padding:0 24px 96px}
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.layout{display:grid;grid-template-columns:180px minmax(0,1fr);gap:56px;align-items:start}
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@media (max-width:960px){.layout{grid-template-columns:1fr;gap:0}.rail{display:none}}
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/* ---------- rail ---------- */
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.rail{position:sticky;top:28px;padding-top:8px;font-family:var(--font-display);font-size:12px;line-height:1.5}
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.rail ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px}
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.rail a{color:var(--ink-3);text-decoration:none;display:flex;gap:9px}
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.rail a:hover,.rail a:focus-visible{color:var(--brass)}
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.rail .n{font-family:var(--font-mono);font-size:10px;color:var(--rule-strong);min-width:16px;padding-top:1px}
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.rail .grp{margin-top:14px;font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--rule-strong)}
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/* ---------- header ---------- */
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header{padding:64px 0 40px;border-bottom:2px solid var(--ink);margin-bottom:44px}
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.eyebrow{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);display:flex;flex-wrap:wrap;gap:14px;margin-bottom:22px}
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.eyebrow .stat{color:var(--clay)}
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h1{font-family:var(--font-display);font-weight:800;letter-spacing:-.035em;line-height:.94;font-size:clamp(46px,9vw,92px);margin:0 0 6px;text-wrap:balance}
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.sub{font-family:var(--font-display);font-weight:500;font-size:clamp(16px,2.4vw,21px);letter-spacing:-.01em;color:var(--ink-2);margin:0 0 30px;max-width:34ch;line-height:1.3}
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.metagrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px 28px;border-top:1px solid var(--rule);padding-top:20px}
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.metagrid dt{font-family:var(--font-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);margin-bottom:5px}
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.metagrid dd{margin:0;font-family:var(--font-display);font-size:13.5px;line-height:1.45;color:var(--ink)}
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/* ---------- typography ---------- */
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section{margin-bottom:60px;scroll-margin-top:24px}
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h2{font-family:var(--font-display);font-weight:750;letter-spacing:-.022em;font-size:clamp(24px,3.4vw,31px);line-height:1.12;margin:0 0 18px;text-wrap:balance;display:flex;gap:14px;align-items:baseline}
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h2 .sn{font-family:var(--font-mono);font-size:12px;font-weight:400;color:var(--brass);letter-spacing:.06em;flex:none;padding-top:2px}
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h3{font-family:var(--font-display);font-weight:700;font-size:16px;letter-spacing:-.008em;margin:34px 0 10px;color:var(--ink)}
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p{margin:0 0 15px;max-width:var(--measure)}
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ul,ol{max-width:var(--measure);margin:0 0 15px;padding-left:20px}
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li{margin-bottom:7px}
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strong{font-weight:600}
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em{font-style:italic}
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code{font-family:var(--font-mono);font-size:.855em;background:var(--surface-2);padding:1px 5px;border-radius:2px}
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a{color:var(--brass)}
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.lede{font-size:19px;line-height:1.55;color:var(--ink-2);max-width:60ch}
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/* ---------- devices ---------- */
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.callout{border-left:3px solid var(--brass);background:var(--brass-soft);padding:18px 22px;margin:0 0 24px;max-width:var(--measure)}
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.callout p:last-child{margin-bottom:0}
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.callout .lbl{font-family:var(--font-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--brass);display:block;margin-bottom:8px}
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.rule-quote{border-top:2px solid var(--ink);border-bottom:2px solid var(--ink);padding:26px 0;margin:28px 0;max-width:var(--measure)}
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.rule-quote p{font-family:var(--font-display);font-weight:600;font-size:19px;line-height:1.38;letter-spacing:-.014em;margin:0;text-wrap:balance}
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.hard{border-left:3px solid var(--clay);background:var(--clay-soft);padding:18px 22px;margin:0 0 24px;max-width:var(--measure)}
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.hard .lbl{font-family:var(--font-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--clay);display:block;margin-bottom:8px}
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.hard p:last-child{margin-bottom:0}
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.dec{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;color:var(--brass);text-transform:uppercase}
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.vec{font-family:var(--font-mono);font-size:.9em;font-weight:600;background:var(--surface-2);padding:2px 7px;border-radius:2px;white-space:nowrap;letter-spacing:.04em}
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/* ---------- tables ---------- */
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.scroll{overflow-x:auto;margin:0 0 24px;-webkit-overflow-scrolling:touch}
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table{border-collapse:collapse;width:100%;min-width:520px;font-family:var(--font-display);font-size:13.5px;line-height:1.45}
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th{text-align:left;font-family:var(--font-mono);font-size:9.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);font-weight:400;padding:0 16px 8px 0;border-bottom:1px solid var(--rule-strong);vertical-align:bottom}
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td{padding:11px 16px 11px 0;border-bottom:1px solid var(--rule);vertical-align:top;color:var(--ink-2)}
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td:first-child{color:var(--ink);font-weight:600}
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tbody tr:last-child td{border-bottom:none}
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.lvl{font-family:var(--font-mono);font-weight:600;font-size:12px;letter-spacing:.04em;color:var(--ink)}
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/* ---------- ladders ---------- */
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.breakout{margin:34px 0 40px}
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.bhead{display:flex;justify-content:space-between;align-items:baseline;gap:20px;border-bottom:1px solid var(--rule-strong);padding-bottom:9px;margin-bottom:22px;flex-wrap:wrap}
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.bhead h3{margin:0;font-size:13px;letter-spacing:.1em;text-transform:uppercase;font-family:var(--font-mono);font-weight:400;color:var(--ink-3)}
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.bhead .note{font-family:var(--font-display);font-size:12.5px;color:var(--ink-3)}
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.ladders{display:grid;gap:26px}
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.ladder{display:grid;grid-template-columns:126px minmax(0,1fr);gap:18px;align-items:start}
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@media (max-width:700px){.ladder{grid-template-columns:1fr;gap:10px}}
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.ladder .pname{font-family:var(--font-display);font-weight:700;font-size:14px;letter-spacing:-.01em;padding-top:2px}
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.ladder .pname span{display:block;font-family:var(--font-mono);font-size:10px;font-weight:400;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin-top:3px}
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.rungs{display:grid;gap:3px;grid-template-columns:repeat(5,minmax(0,1fr))}
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@media (max-width:700px){.rungs{grid-template-columns:repeat(2,minmax(0,1fr))}}
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.rung{padding:9px 10px 11px;background:var(--surface);border-top:4px solid var(--l0);min-width:0}
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.rung.r1{border-top-color:var(--l1)} .rung.r2{border-top-color:var(--l2)}
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.rung.r3{border-top-color:var(--l3)} .rung.r4{border-top-color:var(--l4)}
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.rung .code{font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.06em;color:var(--ink);display:block;margin-bottom:4px}
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.rung .txt{font-family:var(--font-display);font-size:11.5px;line-height:1.34;color:var(--ink-2);display:block}
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.rung.na{opacity:.42}
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/* ---------- matrix ---------- */
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.matrix-shell{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:stretch;margin-bottom:14px}
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.ylab{writing-mode:vertical-rl;transform:rotate(180deg);font-family:var(--font-mono);font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);text-align:center;padding-bottom:22px}
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.mgrid{display:grid;grid-template-columns:34px repeat(5,minmax(0,1fr));gap:3px}
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.mcell{background:var(--surface);min-height:60px;padding:6px;display:flex;flex-direction:column;justify-content:flex-end;gap:4px;min-width:0}
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.mcell.tint1{background:color-mix(in srgb,var(--l1) 26%,var(--surface))}
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.mcell.tint2{background:color-mix(in srgb,var(--l2) 26%,var(--surface))}
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.mcell.tint3{background:color-mix(in srgb,var(--l3) 24%,var(--surface))}
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.mcell.tint4{background:color-mix(in srgb,var(--l4) 22%,var(--surface))}
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.mcell.void{background:repeating-linear-gradient(135deg,transparent,transparent 5px,var(--rule) 5px,var(--rule) 6px);opacity:.55}
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.rlab,.clab{font-family:var(--font-mono);font-size:10px;font-weight:600;letter-spacing:.05em;color:var(--ink-3);display:flex;align-items:center;justify-content:center}
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.rlab{min-height:60px}
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.clab{padding-top:7px;min-height:22px}
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.pin{font-family:var(--font-mono);font-size:9.5px;font-weight:600;letter-spacing:.02em;background:var(--ink);color:var(--paper);padding:2px 5px;border-radius:2px;line-height:1.3;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
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.pin.ghost{background:transparent;color:var(--ink-2);border:1px dashed var(--rule-strong)}
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.mnote{display:flex;gap:22px;flex-wrap:wrap;font-family:var(--font-display);font-size:12px;color:var(--ink-3);padding-top:6px}
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.mnote .k{display:flex;align-items:center;gap:7px}
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.sw{width:13px;height:13px;flex:none;background:var(--ink)}
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.sw.g{background:transparent;border:1px dashed var(--rule-strong)}
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.sw.v{background:repeating-linear-gradient(135deg,transparent,transparent 4px,var(--rule) 4px,var(--rule) 5px);border:1px solid var(--rule)}
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@media (max-width:640px){
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.mgrid{grid-template-columns:28px repeat(5,minmax(0,1fr))}
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.mcell{min-height:52px;padding:4px}
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.pin{font-size:8px;padding:1px 3px}
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.rlab{min-height:52px}
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}
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/* ---------- methodology ---------- */
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.verbs{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:2px;background:var(--rule);border:1px solid var(--rule)}
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.verb{background:var(--surface);padding:18px 18px 20px}
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.verb h4{font-family:var(--font-display);font-weight:750;font-size:15px;margin:0 0 7px;letter-spacing:-.01em}
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.verb p{font-family:var(--font-display);font-size:12.5px;line-height:1.46;color:var(--ink-2);margin:0;max-width:none}
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.verb .step{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.13em;color:var(--brass);display:block;margin-bottom:9px}
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/* ---------- questions ---------- */
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.qs{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--rule-strong)}
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.q{display:grid;grid-template-columns:34px minmax(0,1fr) 170px;gap:18px;padding:16px 0;border-bottom:1px solid var(--rule);align-items:start}
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@media (max-width:760px){.q{grid-template-columns:28px minmax(0,1fr);gap:12px}.q .owner{grid-column:2}}
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.q .qn{font-family:var(--font-mono);font-size:11px;color:var(--brass);padding-top:3px}
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.q .qt{font-family:var(--font-display);font-size:14px;line-height:1.48;color:var(--ink-2)}
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.q .qt b{color:var(--ink);font-weight:700;display:block;margin-bottom:2px;font-size:14.5px}
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.owner{font-family:var(--font-mono);font-size:10px;letter-spacing:.05em;color:var(--ink-3);padding-top:4px}
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.owner .tag{display:inline-block;border:1px solid var(--rule-strong);padding:2px 7px;border-radius:2px}
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.owner .tag.need{border-color:var(--clay);color:var(--clay)}
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/* ---------- misc ---------- */
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.numbers{font-family:var(--font-mono);font-size:12.5px;line-height:1.85;background:var(--surface);border-left:3px solid var(--l3);padding:16px 20px;margin:0 0 22px;overflow-x:auto;max-width:var(--measure)}
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.numbers .v{color:var(--ink);font-weight:600}
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.numbers .k{color:var(--ink-3)}
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pre{font-family:var(--font-mono);font-size:12.5px;line-height:1.68;background:var(--surface);border-left:3px solid var(--rule-strong);padding:16px 20px;overflow-x:auto;margin:0 0 22px;max-width:var(--measure);color:var(--ink-2)}
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.alt{border-bottom:1px solid var(--rule);padding:14px 0;max-width:var(--measure)}
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.alt:last-of-type{border-bottom:none}
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.alt b{font-family:var(--font-display);font-size:14px;display:block;margin-bottom:3px}
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.alt p{font-size:14.5px;margin:0;color:var(--ink-2)}
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.alt .verdict{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--clay)}
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footer{border-top:2px solid var(--ink);margin-top:20px;padding-top:22px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--ink-3);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
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.tm td,.tm th{text-align:center}
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.tm td:first-child,.tm th:first-child{text-align:left}
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.yes{color:var(--l4);font-weight:700}
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.no{color:var(--clay);font-weight:700}
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.kind{font-family:var(--font-mono);font-size:9px;letter-spacing:.09em;text-transform:uppercase;padding:2px 6px;border-radius:2px;white-space:nowrap;border:1px solid var(--rule-strong);color:var(--ink-3)}
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.kind.adv{border-color:var(--clay);color:var(--clay)}
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.routes{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:2px;background:var(--rule);border:1px solid var(--rule);margin:0 0 22px}
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.route{background:var(--surface);padding:16px 18px}
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.route h4{font-family:var(--font-display);font-weight:750;font-size:14px;margin:0 0 6px}
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.route p{font-family:var(--font-display);font-size:12.5px;line-height:1.45;color:var(--ink-2);margin:0;max-width:none}
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.route .tag{font-family:var(--font-mono);font-size:9px;letter-spacing:.1em;text-transform:uppercase;color:var(--brass);display:block;margin-bottom:8px}
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a:focus-visible,.rail a:focus-visible{outline:2px solid var(--brass);outline-offset:3px}
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@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
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</style>
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<div class="wrap"><header><div class="eyebrow"><span>RMASTER-ADR-0005</span> <span class="stat">accepted · accepted-1</span> <span>railiance-master</span> <span>reviewed 2026-07-26</span><span>generated from canonical source — do not edit</span></div><h1>Derived Rail Composition</h1><p class="sub">Source: <code>railiance-master · docs/adr/ADR-0005-derived-rail-composition.md · 883533ed8af1703cc9bb4a2b24137e325bbbda47</code></p><p class="sub">Review due: 2027-01-26</p></header><div class="layout"><nav class="rail" aria-label="Sections"><ol><li><a href="#context"><span class="n">·</span>Context</a></li><li><a href="#decision"><span class="n">·</span>Decision</a></li><li><a href="#consequences"><span class="n">·</span>Consequences</a></li></ol></nav><main><p>Date: 2026-07-26 Status: Accepted</p>
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<section id="context"><h2>Context</h2>
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<p>Knative provides distinct workload activation and revision semantics but runs on Kubernetes. Treating it as an unrelated peer rail would duplicate generic workload lifecycle and substrate assumptions.</p>
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</section>
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<section id="decision"><h2>Decision</h2>
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<p>Railiance distinguishes base and derived rails.</p>
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<p><code>rail-kubernetes</code> is the default base rail for platform workloads. <code>rail-knative</code> is a derived rail that inherits a versioned <code>rail-kubernetes</code> common contract and overrides only Knative-specific activation, revision, autoscaling, traffic, cold-start, and rollback semantics.</p>
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<p>The detailed contract is <a href="../rail-composition-contract.md"><code>docs/rail-composition-contract.md</code></a>.</p>
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</section>
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<section id="consequences"><h2>Consequences</h2>
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<ul><li>New platform workloads continue to use <code>rail-kubernetes</code> unless a specialized rail is justified.</li><li>Derived rails declare base-rail compatibility rather than copying lifecycle contracts.</li><li>Fabric and conformance tooling must understand rail dependency and readiness.</li><li>Knative installation stays with the S2 substrate owner.</li></ul>
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</section><footer><span>RMASTER-ADR-0005 · accepted-1 · accepted</span><span>railiance-master · docs/adr/ADR-0005-derived-rail-composition.md · 883533ed8af1703cc9bb4a2b24137e325bbbda47</span></footer></main></div></div></html>
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