feat(web): lamp-only header on the content width

Drops #master-verdict entirely - element, .rail-verdict rules and every
line that wrote into it. The lamp is the only header signal; the
unreachable detail moves onto the board's arr module so nothing is lost.
Rail contents move into .rail-inner capped at the deck's 68rem and
centred, leaving the panel full-bleed.

Committed by the blitz orchestrator: the authoring session wedged with
the work complete on disk and stopped accepting input.

web/src/main.ts

@@ -148,7 +148,6 @@ function must<T extends Element>(selector: string): T {
 function main() {
   const board = must<HTMLElement>(".board");
   const masterLamp = must<HTMLElement>("#master-lamp");
-  const verdict = must<HTMLElement>("#master-verdict");
   const version = must<HTMLElement>("#version");
 
   const master = moduleRefs("master");
@@ -193,10 +192,9 @@ function main() {
 
     if (probe.kind === "unreachable") {
       masterLamp.dataset.state = "unreachable";
-      verdict.dataset.tone = "fault";
-      verdict.textContent = `daemon unreachable — ${probe.detail}`;
       version.textContent = "v —";
-      setModule(master, "unreachable", "fault", "down");
+      // the outage detail lives on the board's arr module — the header has no verdict line
+      setModule(master, "unreachable", "fault", "down", probe.detail);
       for (const refs of Object.values(checks)) {
         setModule(refs, "off", "idle", "no signal");
       }
@@ -210,8 +208,6 @@ function main() {
     const degraded = report.status === "degraded";
 
     masterLamp.dataset.state = degraded ? "degraded" : "ok";
-    verdict.dataset.tone = degraded ? "warn" : "ok";
-    verdict.textContent = degraded ? "chain degraded" : "all signals nominal";
     version.textContent = `v${report.version}`;
 
     setModule(master, degraded ? "degraded" : "ok", degraded ? "warn" : "ok", report.status);