feat(web): real /about and /docs pages (unique crawlable content)

Addresses the top cross-engine AEO finding — every route previously served
the homepage SPA. /about and /docs are now distinct routes with their own
server-rendered content and titles.

- /about: substantive about page (what LogicSRC is, the standards surface,
  CommandBoard.run reference impl, GitHub, hire-us) — derived from public
  positioning, no fabricated team.
- /docs + /docs/[slug]: render the repo's docs/*.md (curated public set) via
  marked, statically generated at build (no runtime fs dependency).
- Drop about/docs from the catch-all; add doc URLs to the sitemap.

Verified in a running build: /about and /docs serve unique content with
distinct titles; /docs/[slug] renders each markdown doc.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/logicsrc-web/src/app/docs/page.tsx

@@ -0,0 +1,53 @@
+import Link from "next/link";
+import type { ReactNode } from "react";
+import type { Metadata } from "next";
+import { listDocs } from "@/lib/docs";
+import { SiteShell } from "@/components/site-shell";
+
+export const metadata: Metadata = {
+  title: "Docs · LogicSRC",
+  description:
+    "LogicSRC specification guides — data model, CLI/TUI conventions, config, permission scopes, plugins, credential sharing, and the OpenSpec.dev comparison.",
+  alternates: { canonical: "/docs" },
+};
+
+export default function DocsIndex(): ReactNode {
+  const docs = listDocs();
+  return (
+    <SiteShell active="Docs">
+      <div className="band">
+        <div className="section-head">
+          <h2>Docs</h2>
+          <p>
+            Specification guides and conventions for the LogicSRC coordination
+            standard. Source lives in the{" "}
+            <a href="https://github.com/profullstack/logicsrc" rel="noreferrer">
+              profullstack/logicsrc
+            </a>{" "}
+            repository.
+          </p>
+        </div>
+        <ul style={{ listStyle: "none", margin: 0, padding: 0 }}>
+          {docs.map((doc) => (
+            <li
+              key={doc.slug}
+              style={{ padding: "1.25rem 0", borderTop: "1px solid #e3e6e0" }}
+            >
+              <Link
+                href={`/docs/${doc.slug}`}
+                style={{ color: "inherit", textDecoration: "none" }}
+              >
+                <h3 style={{ margin: "0 0 0.35rem", fontSize: "1.2rem", color: "#101418" }}>
+                  {doc.title}
+                </h3>
+              </Link>
+              {doc.excerpt ? (
+                <p style={{ color: "#41505d", margin: 0 }}>{doc.excerpt}</p>
+              ) : null}
+            </li>
+          ))}
+        </ul>
+      </div>
+    </SiteShell>
+  );
+}