feat: terminal-noir redesign — widget system + design token overhaul

Replace cyan-green modern theme with terminal-noir aesthetic aligned to
style-guide.md. Hard edges, monospace-first, linear transitions, no gradients.

Introduce Widget component as the single repeatable section primitive:
title bar with horizontal rule, optional badge/meta — all pages and
sections now use this pattern (Glance-inspired data-driven layout).

Design system changes (globals.css):
- Palette: #0a0a0a bg, #111111 surface, #00cc44 status green, #cc2200 alert red
- Drop Montserrat; Source Code Pro primary, system sans for prose only
- Transitions: linear 120ms; no eased animations, no border-radius

Component changes:
- Nav: flat, border-bottom only, lowercase links
- Hero: 56px square photo, status dot, @ email glyph
- ProjectCard: flat bordered card, 2-col grid, no gradient tile
- Skills: key-value rows with dot-separated values
- Footer: minimal text links

Pages: all sections wrapped in Widget; homelab uses gap-px grid for
at-a-glance, services, and ADRs sections. Archive uses flat list layout.

Data: remove gradient field from Project type; add optional year field

src/components/Widget.tsx

@@ -0,0 +1,39 @@
+type WidgetProps = {
+  title: string;
+  badge?: string | number;
+  meta?: string;
+  as?: "section" | "div" | "article";
+  className?: string;
+  children: React.ReactNode;
+};
+
+export default function Widget({
+  title,
+  badge,
+  meta,
+  as: Tag = "section",
+  className,
+  children,
+}: WidgetProps) {
+  return (
+    <Tag className={`mb-12 ${className ?? ""}`}>
+      <div className="flex items-center gap-3 mb-6">
+        <span className="font-mono text-xs text-[var(--color-text-label)] tracking-widest uppercase whitespace-nowrap">
+          {title}
+        </span>
+        {meta && (
+          <span className="font-mono text-xs text-[var(--color-text-dim)] whitespace-nowrap">
+            {meta}
+          </span>
+        )}
+        <div className="flex-1 h-px bg-[var(--color-border)]" aria-hidden="true" />
+        {badge !== undefined && (
+          <span className="font-mono text-xs text-[var(--color-text-dim)] whitespace-nowrap">
+            {badge}
+          </span>
+        )}
+      </div>
+      {children}
+    </Tag>
+  );
+}