feat: Hermit 1.1.0 — HERMIT_* env, Tauri desktop shell

Wire hermit_getenv across the engine, rebrand WebUI/systemd/docs, and
add apps/desktop (Tauri 2 + React) with a DeepSeek-Harness-like UI.
Qt app/ is frozen; full libcstcore FFI is scaffolded behind --features engine.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/app.js

@@ -1,4 +1,4 @@
-/* CST-Agent WebUI client: HTTP + SSE against the engine in the same binary.
+/* Hermit WebUI client: HTTP + SSE against the engine in the same binary.
  * No build step, no dependencies. The server renders Markdown to sanitized
  * HTML; this file lays out the conversation, the tool lines, the approval
  * gate and the anchored popovers. Protocol: docs/webui.md. */
@@ -562,7 +562,7 @@ async function loadSession() {
   }
   showEmpty(log.children.length === 0);
   const last = [...(data.messages || [])].reverse().find((m) => m.role === 'user' && !m.note && !m.tool_result);
-  document.title = (last && last.content ? last.content.slice(0, 40) + ' · ' : '') + 'CST-Agent';
+  document.title = (last && last.content ? last.content.slice(0, 40) + ' · ' : '') + 'Hermit';
   scrollDown(true);
   updateJump();
 }