docs: put daemon mode on the website and tighten the README

The website made three claims daemon mode falsifies — "No TTY, no daemon",
"no daemon, no MCP server, no API key", and "no GUI and no daemon mode yet"
under what-this-is-not. All three corrected.

Adds a docs section and a home feature card, both leading with the reason
rather than the mechanics: the server allows one session per account, so
parallel one-shot commands either displace each other or mean a throwaway
username per run, which is account churn on infrastructure other people
maintain. A daemon is one login for as long as you work.

The README section said that three times over and buried the reasoning below
the mechanics; rewritten to state it once, up front. It now also covers which
commands stay local and that shares add reaches a running daemon, which was
meant to land earlier and silently did not — the edit anchored on text that
only existed in SKILL.md.

website/src/pages/home.tsx

@@ -59,6 +59,19 @@ const FEATURES = [
       </>
     ),
   },
+  {
+    glyph: '◈',
+    color: 'var(--accent-text)',
+    title: 'Daemon mode',
+    cmd: 'soulseek-rs daemon',
+    body: (
+      <>
+        Hold one session and let every other command borrow it &mdash; the network allows
+        one login per account, so this is the neighbourly way to run several at once. It
+        speaks JSON-RPC, so other tools can drive it too.
+      </>
+    ),
+  },
   {
     glyph: '›',
     color: 'var(--status-info)',
@@ -276,8 +289,10 @@ const Agents = () => (
         queueing behind before a 2 GB transfer.
       </p>
       <p>
-        It stays a CLI: no daemon, no MCP server, no API key. Upgrading the binary upgrades
-        the skill; rerun <Code>skills install</Code> to take it.{' '}
+        It stays a CLI: no MCP server, no API key. The skill tells your agent to start a
+        daemon first, so a batch of parallel requests is one login rather than one per
+        command. Upgrading the binary upgrades the skill; rerun <Code>skills install</Code>{' '}
+        to take it.{' '}
         <Link to="/docs" className="text-link hover:text-link-hover">
           See the commands
         </Link>